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Making Access to Astronomical Software More Efficient
Astronomical Software Wants To Be Free: A Manifesto
Publish your computer code: it is good enough
Talking Amongst Ourselves - Communication in the Astronomical Software Community
Computational science: ...Error …why scientific programming does not compute
A Journal for the Astronomical Computing Community?
Where's the Real Bottleneck in Scientific Computing?
The CRAPL: An academic-strength open source license
Scientific Software Production: Incentives and Collaboration
Linking to Data - Effect on Citation Rates in Astronomy
The case for open computer programs
Astroinformatics: A 21st Century Approach to Astronomy
Publish or be damned? An alternative impact manifesto for research software
Best Practices for Scientific Computing
Practices in source code sharing in astrophysics
Shining Light into Black Boxes
A Quick Guide to Software Licensing for the Scientist-Programmer
Troubling Trends in Scientific Software Use
Optimizing Peer Review of Software Code
Collaboration gets the most out of software
The future of journal submissions (added 3/25/14)
Reproducible Research in Computational Science (added 4/5/14)
Science Code Manifesto (added 6/20/14)
Reproducible research is still a challenge (added 6/21/14)
Data Citation and Sharing: What’s in it for me? (added 9/18/14)
Free Access to Science Research Doesn't Benefit Everyone (added 12/23/14)
The top 100 papers (added 12/23/14)
Code share: Papers in Nature journals should make computer code accessible where possible. (added 01/10/15)
Trip Report: NSF Software & Data Citation Workshop (added 02/07/15)
Scientific coding and software engineering: what's the difference? (added 02/07/15)
Is there evidence that open source research software produces more uptake of methods? (added 02/07/15)
What constitutes a citable scientific work? (added 02/08/15)
Opinion: Reproducible research can still be wrong: Adopting a prevention approach (added 02/16/15)
Code Sharing – read our tips and share your own (added 2/20/15)
How could code review discourage code disclosure? Reviewers with motivation. (added 04/24/15)
Code review (added 04/24/15)
Please destroy this software after publication. kthxbye. (added 04/24/15)
Rule rewrite aims to clean up scientific software (added 04/24/15)
Workshop Report: NSF Workshop on Supporting Scientific Discovery through Norms and Practices for Software and Data Citation and Attribution (added 04/24/15)
On publishing software (added 04/24/15)
Someone Else's Code: setting collaborators up for success (added 05/19/15)
Promoting an open research culture (added 06/29/15)
How computers broke science – and what we can do to fix it (added 11/11/15)
Why we need to create careers for research software engineers (added 11/12/15)
Understanding the scientific software ecosystem and its impact: Current and future measures (added 11/23/15)
The hidden benefits of open-source software (added 11/29/15)
Reviewing computational methods (added 12/01/15)
SoftwareX (added 12/01/15)
When Windows Software is Harder Than GNU/Linux (added 12/05/15)
Why we need a hub for software in science (added 12/05/15)
Secret Data (added 12/30/15)
Research integrity: Don't let transparency damage science (added 01/31/16)
From reproducibility to over-reproducibility (added 02/29/16)
Software search is not a science, even among scientists (added 5/12/16)
1,500 scientists lift the lid on reproducibility (added 06/05/16)
Software for reproducible science: let’s not have a misunderstanding (added 07/16/16)
Initial steps toward reproducible research (added 07/16/16)
Good Enough Practices in Scientific Computing (added 09/05/16)
Software Preservation Network: Legal and Policy Aspects of Software Preservation (added 09/28/16)
The Astropy Problem (added 10/12/16)
Engineering Academic Software (added 11/18/16)
Reproducible Research Needs Some Limiting Principles (added 02/05/17)
Toward standard practices for sharing computer code and programs in neuroscience (added 06/03/2017)
Dagstuhl Manifestos: Engineering Academic Software (added 06/03/2017)
Citations for Software: Providing Identification, Access and Recognition for Research Software (added 06/19/2017)
How I learned to stop worrying and love the coming archivability crisis in scientific software (added 08/19/2017)
Software Heritage: Why and How to Preserve Software Source Code (added 09/23/2017)
10 Ways to keep your successful scientific software alive (added 11/02/2017)
A few things that would reduce stress around reproducibility/replicability in science (added 11/27/2017)
An empirical analysis of journal policy effectiveness for computational reproducibility (added 03/18/2018)
Metaphors We Work By: Reframing Digital Objects, Significant Properties, and the Design of Digital Preservation Systems (added 05/14/2018)
Before reproducibility must come preproducibility (added 05/29/2018)
Testing Scientific Software: A Systematic Literature Review (added 09/11/2018)
Nature Research journals trial new tools to enhance code peer review and publication (added 10/12/2018)
Computational astrophysics for the future (added 10/12/2018)
Abstract: Access to astronomical data through archives and VO is essential but does not solve all problems. Availability of appropriate software for analyzing the data is often equally important for the efficiency with which a researcher can publish results. A number of legacy systems (e.g. IRAF, MIDAS, Starlink, AIPS, Gipsy), as well as others now coming online are available but have very different user interfaces and may no longer be fully supported. Users may need multiple systems or stand-alone packages to complete the full analysis which introduces significant overhead. The OPTICON Network on "Future Astronomical Software Environments" and the USVAO have discussed these issues and have outlined a general architectural concept that solves many of the current problems in accessing software packages. It foresees a layered structure with clear separation of astronomical code and IT infrastructure. By relying on modern IT concepts for messaging and distributed execution, it provides full scalability from desktops to clusters of computers. A generic parameter passing mechanism and common interfaces will offer easy access to a wide range of astronomical software, including legacy packages, through a single scripting language such as Python. A prototype based upon a proposed standard architecture is being developed as a proof-of-concept. It will be followed by definition of standard interfaces as well as a reference implementation which can be evaluated by the user community. For the long-term success of such an environment, stable interface specifications and adoption by major astronomical institutions as well as a reasonable level of support for the infrastructure are mandatory. Development and maintenance of astronomical packages would follow an open-source, Internet concept.
Authors: P. Grosbol, D. Tody
Abstract: Astronomical software is now a fact of daily life for all hands-on members of our community. Purpose-built software for data reduction and modeling tasks becomes ever more critical as we handle larger amounts of data and simulations. However, the writing of astronomical software is unglamorous, the rewards are not always clear, and there are structural disincentives to releasing software publicly and to embedding it in the scientific literature, which can lead to significant duplication of effort and an incomplete scientific record. We identify some of these structural disincentives and suggest a variety of approaches to address them, with the goals of raising the quality of astronomical software, improving the lot of scientist-authors, and providing benefits to the entire community, analogous to the benefits provided by open access to large survey and simulation datasets. Our aim is to open a conversation on how to move forward. We advocate that: (1) the astronomical community consider software as an integral and fundable part of facility construction and science programs; (2) that software release be considered as integral to the open and reproducible scientific process as are publication and data release; (3) that we adopt technologies and repositories for releasing and collaboration on software that have worked for open-source software; (4) that we seek structural incentives to make the release of software and related publications easier for scientist-authors; (5) that we consider new ways of funding the development of grass-roots software; (6) and that we rethink our values to acknowledge that astronomical software development is not just a technical endeavor, but a fundamental part of our scientific practice.
Credit: Benjamin J. Weiner, Michael R. Blanton, Alison L. Coil, Michael C. Cooper, Romeel Davé, David W. Hogg, Bradford P. Holden, Patrik Jonsson, Susan A. Kassin, Jennifer M. Lotz, John Moustakas, Jeffrey A. Newman, J.X. Prochaska, Peter J. Teuben, Christy A. Tremonti, Christopher N.A. Willmer
by Nick Barnes
... openness improved both the code used by the scientists and the ability of the public to engage with their work. This is to be expected. Other scientific methods improve through peer review. The open-source movement has led to rapid improvements within the software industry. But science source code, not exposed to scrutiny, cannot benefit in this way.
Abstract: Meetings such as ADASS demonstrate that there is an enthusiasm for communication within the astronomical software community. However, the amount of information and experience that can flow around in the course of one, relatively short, meeting is really quite limited. Ideally, these meetings should be just a part of a much greater, continuous exchange of knowledge. In practice, with some notable - but often short-lived - exceptions, we generally fall short of that ideal. Keeping track of what is being used, where, and how successfully, can be a challenge. A variety of new technologies such as those roughly classed as 'Web 2.0' are now available, and getting information to flow ought to be getting simpler, but somehow it seems harder to find the time to keep that information current. This paper looks at some of the ways we communicate, used to communicate, have failed to communicate, no longer communicate, and perhaps could communicate better. It is presented in the hope of stimulating additional discussion - and possibly even a little action - aimed at improving the current situation.
Credit: Keith Shortridge
by Zeeya Merali
A quarter of a century ago, most of the computing work done by scientists was relatively straightforward. But as computers and programming tools have grown more complex, scientists have hit a "steep learning curve", says James Hack, director of the US National Center for Computational Sciences at Oak Ridge National Laboratory in Tennessee. "The level of effort and skills needed to keep up aren't in the wheelhouse of the average scientist."
As a general rule, researchers do not test or document their programs rigorously, and they rarely release their codes, making it almost impossible to reproduce and verify published results generated by scientific software, say computer scientists. At best, poorly written programs cause researchers such as Harry to waste valuable time and energy. But the coding problems can sometimes cause substantial harm, and have forced some scientists to retract papers.
As recognition of these issues has grown, software experts and scientists have started exploring ways to improve the codes used in science.
Abstract: One of the Birds of a Feather (BoF) discussion sessions at ADASS XX considered whether a new journal is needed to serve the astronomical computing community. In this paper we discuss the nature and requirements of that community, outline the analysis that led us to propose this as a topic for a BoF, and review the discussion from the BoF session itself. We also present the results from a survey designed to assess the suitability of astronomical computing papers of different kinds for publication in a range of existing astronomical and scientific computing journals. The discussion in the BoF session was somewhat inconclusive, and it seems likely that this topic will be debated again at a future ADASS or in a similar forum.
Credit: Norman Gray, Robert G. Mann
By Greg Wilson
Most scientists had simply never been shown how to program efficiently. After a generic freshman programming course in C or Java, and possibly a course on statistics or numerical methods in their junior or senior year, they were expected to discover or reinvent everything else themselves, which is about as reasonable as showing someone how to differentiate polynomials and then telling them to go and do some tensor calculus.
Yes, the relevant information was all on the Web, but it was, and is, scattered across hundreds of different sites. More important, people would have to invest months or years acquiring background knowledge before they could make sense of it all. As another physicist (somewhat older and more cynical than my friend) said to me when I suggested that he take a couple of weeks and learn some Perl, "Sure, just as soon as you take a couple of weeks and learn some quantum chromodynamics so that you can do my job."
By Matt Might
Academics rarely release code, but I hope a license can encourage them.
Generally, academic software is stapled together on a tight deadline; an expert user has to coerce it into running; and it's not pretty code. Academic code is about "proof of concept." These rough edges make academics reluctant to release their software. But, that doesn't mean they shouldn't.
Most open source licenses (1) require source and modifications to be shared with binaries, and (2) absolve authors of legal liability.
An open source license for academics has additional needs: (1) it should require that source and modifications used to validate scientific claims be released with those claims; and (2) more importantly, it should absolve authors of shame, embarrassment and ridicule for ugly code.
Openness should also hinge on publication: once a paper is accepted, the license should force the release of modifications. During peer review, the license should enable the confidential disclosure of modifications to peer reviewers. If the paper is rejected, the modifications should remain closed to protect the authors' right to priority.
Toward these ends, I've drafted the CRAPL--the Community Research and Academic Programming License. The CRAPL is an open source "license" for academics that encourages code-sharing, regardless of how much how much Red Bull and coffee went into its production. (The text of the CRAPL is in the article body.)
Abstract: Software plays an increasingly critical role in science, including data analysis, simulations, and managing workflows. Unlike other technologies supporting science, software can be copied and distributed at essentially no cost, potentially opening the door to unprecedented levels of sharing and collaborative innovation. Yet we do not have a clear picture of how software development for science fits into the day-to-day practice of science, or how well the methods and incentives of its production facilitate realization of this potential. We report the results of a multiple-case study of software development in three fields: high energy physics, structural biology, and microbiology. In each case, we identify a typical publication, and use qualitative methods to explore the production of the software used in the science represented by the publication. We identify several different production systems, characterized primarily by differences in incentive structures. We identify ways in which incentives are matched and mismatched with the needs of the science fields, especially with respect to collaboration.
Credit: James Howison and Jim Herbsleb
Abstract: Is there a difference in citation rates between articles that were published with links to data and articles that were not? Besides being interesting from a purely academic point of view, this question is also highly relevant for the process of furthering science. Data sharing not only helps the process of verification of claims, but also the discovery of new findings in archival data. However, linking to data still is a far cry away from being a "practice", especially where it comes to authors providing these links during the writing and submission process. You need to have both a willingness and a publication mechanism in order to create such a practice. Showing that articles with links to data get higher citation rates might increase the willingness of scientists to take the extra steps of linking data sources to their publications. In this presentation we will show this is indeed the case: articles with links to data result in higher citation rates than articles without such links. The ADS is funded by NASA Grant NNX09AB39G.
Credit: Edwin A. Henneken, Alberto Accomazzi
by Darrel C. Ince, Leslie Hatton & John Graham-Cumming
We examine the problem of reproducibility (for an early attempt at solving it, see ref. 1) in the context of openly available computer programs, or code. Our view is that we have reached the point that, with some exceptions, anything less than release of actual source code is an indefensible approach for any scientific results that depend on computation, because not releasing such code raises needless, and needlessly confusing, roadblocks to reproducibility.
Abstract: Data volumes from multiple sky surveys have grown from gigabytes into terabytes during the past decade, and will grow from terabytes into tens (or hundreds) of petabytes in the next decade. This exponential growth of new data both enables and challenges effective astronomical research, requiring new approaches. Thus far, astronomy has tended to address these challenges in an informal and ad hoc manner, with the necessary special expertise being assigned to e-Science or survey science. However, we see an even wider scope and therefore promote a broader vision of this data-driven revolution in astronomical research. For astronomy to effectively cope with and reap the maximum scientific return from existing and future large sky surveys, facilities, and data-producing projects, we need our own information science specialists. We therefore recommend the formal creation, recognition, and support of a major new discipline, which we call Astroinformatics. Astroinformatics includes a set of naturally-related specialties including data organization, data description, astronomical classification taxonomies, astronomical concept ontologies, data mining, machine learning, visualization, and astrostatistics. By virtue of its new stature, we propose that astronomy now needs to integrate Astroinformatics as a formal sub-discipline within agency funding plans, university departments, research programs, graduate training, and undergraduate education. Now is the time for the recognition of Astroinformatics as an essential methodology of astronomical research. The future of astronomy depends on it.
Credit: Kirk D. Borne
By Neil Chue Hong
The Research Software Impact Manifesto
... we subscribe to the following principles:
- Communality: software is considered as the collective creation of all who have contributed
- Openness: the ability of others to reuse, extend and repurpose our software should be rewarded
- One of Many: we recognise that software is an intrinsic part of research, and should not be divorced from other research outputs
- Pride: we shouldn't be embarassed by publishing code which is imperfect, nor should other people embarass us
- Explanation: we will provide sufficient associated data and metadata to allow the significant characteristics of the software to be defined
- Recognition: if we use a piece of software for our research we will acknowledge its use and let its authors know
- Availability: when a version of software is "released" we commit to making it available for an extended length of time
- Tools: the methods of identification and description of software objects must lend themselves to the simple use of multiple tools for tracking impact
- Equality: credit is due to both the producer and consumer in equal measure, and due to all who have contributed, whether they are academics or not
Abstract: Scientists spend an increasing amount of time building and using software. However, most scientists are never taught how to do this efficiently. As a result, many are unaware of tools and practices that would allow them to write more reliable and maintainable code with less effort. We describe a set of best practices for scientific software development that have solid foundations in research and experience, and that improve scientists' productivity and the reliability of their software.
Credit: D. A. Aruliah, C. Titus Brown, Neil P. Chue Hong, Matt Davis, Richard T. Guy, Steven H. D. Haddock, Katy Huff, Ian Mitchell, Mark Plumbley, Ben Waugh, Ethan P. White, Greg Wilson, Paul Wilson
Edited 10/28/13: This paper has been updated; the newest version is here: http://arxiv.org/abs/1210.0530v4
Credit: Greg Wilson, D. A. Aruliah, C. Titus Brown, Neil P. Chue Hong, Matt Davis, Richard T. Guy, Steven H. D. Haddock, Katy Huff, Ian M. Mitchell, Mark Plumbley, Ben Waugh, Ethan P. White, Paul Wilson
Abstract: While software and algorithms have become increasingly important in astronomy, the majority of authors who publish computational astronomy research do not share the source code they develop, making it difficult to replicate and reuse the work. In this paper we discuss the importance of sharing scientific source code with the entire astrophysics community, and propose that journals require authors to make their code publicly available when a paper is published. That is, we suggest that a paper that involves a computer program not be accepted for publication unless the source code becomes publicly available. The adoption of such a policy by editors, editorial boards, and reviewers will improve the ability to replicate scientific results, and will also make computational astronomy methods more available to other researchers who wish to apply them to their data.
Credit: Lior Shamir, John F. Wallin, Alice Allen, Bruce Berriman, Peter Teuben, Robert J. Nemiroff, Jessica Mink, Robert J. Hanisch, Kimberly DuPrie
By A. Morin, J. Urban, P. D. Adams, I. Foster, A. Sali, D. Baker, P. Sliz
The publication and open exchange of knowledge and material form the backbone of scientific progress and reproducibility and are obligatory for publicly funded research. Despite increasing reliance on computing in every domain of scientific endeavor, the computer source code critical to understanding and evaluating computer programs is commonly withheld, effectively rendering these programs “black boxes” in the research work flow. Exempting from basic publication and disclosure standards such a ubiquitous category of research tool carries substantial negative consequences. Eliminating this disparity will require concerted policy action by funding agencies and journal publishers, as well as changes in the way research institutions receiving public funds manage their intellectual property (IP).
By Andrew Morin, Jennifer Urban, Piotr Sliz
Software is the means by which scientists harness the power of computers, and much scientific computing relies on software conceived and developed by other practicing researchers. The task of creating scientific software, however, does not end with the publication of computed results. Making the developed software available for inspection and use by other scientists is essential to reproducibility, peer-review, and the ability to build upon others' work , . In fulfilling expectations to distribute and disseminate their software, scientist-programmers are required to be not only proficient scientists and coders, but also knowledgeable in legal strategies for licensing their software. Navigating the often complex legal landscape of software licensing can be overwhelming, even for sophisticated programmers.
...we offer a primer on software licensing with a focus on the particular needs of the scientist software developer.
By Lucas N. Joppa, Greg McInerny, Richard Harper, Lara Salido, Kenji Takeda, Kenton O’Hara, David Gavaghan, Stephen Emmott
Scientific software code needs to be not only published and made available but also peer-reviewed. That this is not part of the current peer review model means that papers of which science is primarily software based (i.e., most modeling papers) are not currently fully or properly peer-reviewed. It also means peer reviewers need to be able to peer review the code (i.e., be highly computationally literate). Scientific software code should meet a baseline standard of intelligibility in how it is written (and commented on). This requirement is analogous to the widely used standard of English in peer-reviewed publications in order to ensure general accessibility of articles. A standard of transparency and intelligibility of code that affords precise, formal replication of an experiment, model simulation, or data analysis, as well as peer-review of scientific software, needs to be a condition of acceptance of any paper using such software.
By Piotr Sliz and Andrew Morin
... we believe that requiring prepublication peer review of computer source code by journal reviewers would place impossible strain on an already overburdened system. Many scientific journals currently have great difficulty finding sufficient numbers of qualified reviewers to evaluate submissions in a timely and constructive fashion. Requiring that reviewers be able to evaluate not only the scientific merit of a manuscript but also parse, understand, and evaluate what can be thousands or tens of thousands of lines of source code written in one or more of a variety of programming languages is impractical.
A more tenable solution for computer codes is postpublication peer review, where the release of source code is a requirement of publication and interested and appropriately skilled members of the broader scientific community may download and evaluate the code at will.
(In response to this article.)
By Andrew Morin, Ben Eisenbraun, Jason Key, Paul C Sanschagrin, Michael A Timony, Michelle Ottaviano, Piotr Sliz
... as our reliance on software developed by other scientists increases, so do the costs and burdens of supporting this software. However, if these costs and burdens can be shared, they will fall, access to the software will increase, and new computational resources will emerge.
SBGrid (http://www.sbgrid.org) is a collaboration established in 2000 to provide the structural biology community with support for research computing. Such collaborations have traditionally been supported by public funding agencies (Finholt, 2003). However, SBGrid is unique in that its ongoing operations are funded exclusively by its members. By sharing the costs of research computing support across many research groups, SBGrid achieves efficiencies through economies of scale, the sharing of expertise and cooperation to promote common goals.
By Damien Irving
A major consequence of the recent advances in computing is that published research is becoming less reproducible. For instance, Nature recently published a series on the challenges in irreproducible research, which included an article outlining the case for open computer programs. This culminated in substantive changes to the checklist reviewers must consider when assessing a Nature article. Particularly relevant to the weather/climate sciences is that this new checklist encourages “the provision of other source data and supplementary information in unstructured repositories such as Figshare and Dryad.” It also asks whether “computer source code was provided with the paper or deposited in a public repository?”
By Roger D. Peng
Given the barriers to reproducible research, it is tempting to wait for a comprehensive solution to arrive. However, even incremental steps would be a vast improvement over the current situation. To this end, I propose the following steps (in order of increasing impact and cost) that individuals and the scientific community can take. First, anyone doing any computing in their research should publish their code. It does not have to be clean or beautiful, it just needs to be available. Even without the corresponding data, code can be very informative and can be used to check for problems as well as quickly translate ideas. Journal editors and reviewers should demand this so that it becomes routine. Publishing code is something we can do now for almost no additional cost. Free code repositories already exist [for example, GitHub (http://github.com) and SourceForge (http://sourceforge.net)], and at a minimum, code can be published in supporting online material.
By Nick Barnes
Software is a cornerstone of science. Without software, twenty-first century science would be impossible. Without better software, science cannot progress.
But the culture and institutions of science have not yet adjusted to this reality. We need to reform them to address this challenge, by adopting these five principles:
- All source code written specifically to process data for a published paper must be available to the reviewers and readers of the paper.
- The copyright ownership and license of any released source code must be clearly stated.
- Researchers who use or adapt science source code in their research must credit the code’s creators in resulting publications.
- Software contributions must be included in systems of scientific assessment, credit, and recognition.
- Source code must remain available, linked to related materials, for the useful lifetime of the publication.
By Rich FitzJohn, Matt Pennell, Amy Zanne and Will Cornwell
We don't disagree with Titus Brown that partial reproducibility is better than nothing (50% of people making their work 50% reproducible would be better than 5% of people making their work 100% reproducible!). However, we disagree with Titus in his contention that new tools are not needed. The current tools are very raw and too numerous to expect widespread adoption from scientists whose main aim is not reproducibility.
...a research group at Arizona University found that they could only build about half of the published software that they could download, without even testing that the software did what it was intended to do (note that this study is currently being reproduced!).
By Sarah Callaghan
Data sharing and citation is good for the data producer and user because it allows datasets to be found and reused easily, it encourages the proper archiving and curation of data that is important to the scientific record, and it provides rewards to the data producer in the form of data citations, and increased rates of paper citations where the data is shared.
By Rose Eveleth
Making something open isn’t a simple check box or button—it takes work, money, and time. Often those pushing for open access aren't the ones who will have to implement it. And for those building their careers, and particularly for underrepresented groups who already face barriers in academia, being open isn’t necessarily the right choice.
By Richard Van Noorden, Brendan Maher & Regina Nuzzo
... the vast majority describe experimental methods or software that have become essential in their fields.
Papers in Nature journals should make computer code accessible where possible.
Accordingly, our policy now mandates that when code is central to reaching a paper’s conclusions, we require a statement describing whether that code is available and setting out any restrictions on accessibility. Editors will insist on availability where they consider it appropriate: any practical issues preventing code sharing will be evaluated by the editors, who reserve the right to decline a paper if important code is unavailable. Moreover, we will provide a dedicated section in articles in which any information on computer code can be placed. And we will work with individual communities to put together best-practice guidelines and possibly more-detailed rules.
By Paul Groth
The biggest thing will be promoting the actual use of proper citations. James Howison of University of Texas Austin presented interesting deep dive results on how people refer to software in the scientific literature (slide set below) (Githhub). It shows that people want to do this but often don’t know how.
By Daisie Huang, Software Engineer, Dryad Digital Repository
What differentiates scientific coders from research software engineers? Scientists tend to be data-discoverers: they view data as a monolithic chunk to be examined and explore it at a fairly fine scale. Research Software Engineers (and software engineers in general) tend to figure out the goal first and then build a machine to do it well. In order for scientists to fully leverage the discoveries of their predecessors, software engineers are needed to automate and simplify the tasks that scientists already know how to do.
Academia Stack Exchange
In recent years there has been a drive to make science more open. This includes making the software used to perform research open source. The main argument in favour of this idea is that research should be reproducible, which has been addressed in other questions on this site.
I am more interested in the 'impact' that this produces. In particular, is there evidence that by publishing software alongside research papers means that more people use the methods described in the paper?
by Claus Wilke in The Serial Mentor
...I would like to propose four conditions that need to be satisfied for a document to be considered a citable piece of scientific work. The document needs to be: (i) uniquely and unambiguously citable; (ii) available in perpetuity, in unchanged form; (iii) accessible to the public; (iv) self-contained and complete.
by Jeffrey T. Leek and Roger D. Peng
From a computational perspective, there are three major components to a reproducible and replicable study: (i) the raw data from the experiment are available, (ii) the statistical code and documentation to reproduce the analysis are available, and (iii) a correct data analysis must be performed.
Posted by Varsha Khodiyar
We feel that, ideally, it is best to describe all code or software used in a study in a way that supports reproducible research. What does this mean for our authors who would like to share their code alongside their data? What should be included in the code availability section? Here are some suggestions from our editorial team.
Posted by Jeff Leek
I feel we acted in pretty good faith here to try to be honest about our assumptions and open with our code. We also responded quickly and thoroughly to the report of a bug. But the discussant used the fact that we had a bug at all to try to discredit our whole analysis with sarcasm. This sort of thing could absolutely discourage a person from releasing code.
Posted by Karl Broman
We often have a heck of time getting any code out of people; if we are too hard on people regarding the quality of their code, they might become even less willing to share.
Posted by C. Titus Brown
The world of computational science would be better off if people clearly delineated whether or not they wanted anyone else to reuse their software, and I think it's a massive mistake to expect that everyone's software should be reusable.
by Erika Check Hayden
... peer reviewers will now be asked to assess the availability of documentation and algorithms used in computational analyses, not just the description of the work. The journal is also exploring whether peer reviewers can test complex code using services such as Docker, a piece of software that allows study authors to create a shareable representation of their computing environment.
by Stan Ahalt, Tom Carsey, Alva Couch, Rick Hooper, Luis Ibanez, Ray Idaszak, Matthew B. Jones, Jennifer Lin, Erin Robinson
The research community urgently needs new practices and incentives to ensure data producers, software and tool developers, and data curators are credited for their contributions... Section 3 presents a full listing of actionable plans discussed at the workshop; highlights of these include:
- Request that publishers and repositories interlink their platforms and processes so that article references and data set or software citations cross-reference each other.
- Request that the research community develop a primary consistent data and software citation record format to support data and software citation.
- Request that an organization (as yet unidentified) develop guidelines for trusted software repositories for science (similar to trusted digital data repositories).
- Ask federal funding agencies to require every Principal Investigator (PI) to have a permanent human identifier (e.g., ORCID, which resolves critical issues of identifying individuals).
- Data and software repository landing pages should describe the full provenance of the data using appropriate standards.
- Authors should be able to cite data and software in their articles at an appropriate level of granularity.
- Federal funding agencies should support an effort to convene key players to identify and harmonize standards on roles, attribution, value, and transitive credit (in an extensible framework). All key sponsors would be recognized.
- Agencies, publishers, societies, and foundations should fund implementation grants to identify and measure data and software impacts in a way that is relevant to stakeholders and research communities.
by Mick Watson
The problem of accepting a paper where the authors present a novel method but a software implementation that cannot be re-used, is that this is software publication by stealth. Because the software will be re-used – by the authors. This is a way in which computational biologists can publish a method without enabling others to easily carry out that method; it’s back to the “trade secrets” publication style of the 1700s. It’s saying “I want the paper, but I am going to keep the software to myself, so that we have an advantage over everyone else”. In short, it is the absolute antithesis of what I think a publication is for.
by Bill Mills
Making sense of someone else's code is harder than writing your own. Write your own, and you can choose tools and techniques you are comfortable with, in patterns that make intuitive sense to you, one step at a time. Use someone else's, and there's no telling what will come up. For most, myself included for many years, that's game over - figuring out what code science hath wrought can feel like too big a barrier to be worthwhile.
How can we make this easier? How can we set open science up to welcome newcomers? Recently I've been exploring the possibility of building better on-ramps to coding projects, in the form of the Ten Minute Plan.
by B. A. Nosek, G. Alter, G. C. Banks, D. Borsboom, S. D. Bowman, S. J. Breckler, S. Buck, C. D. Chambers, G. Chin, G. Christensen, M. Contestabile, A. Dafoe, E. Eich, J. Freese, R. Glennerster, D. Goroff, D. P. Green, B. Hesse, M. Humphreys, J. Ishiyama, D. Karlan, A. Kraut, A. Lupia, P. Mabry, T. A. Madon, N. Malhotra, E. Mayo-Wilson, M. McNutt, E. Miguel, E. Levy Paluck, U. Simonsohn, C. Soderberg, B. A. Spellman, J. Turitto, G. VandenBos, S. Vazire, E. J. Wagenmakers, R. Wilson, T. Yarkoni
Level 1 is designed to have little to no barrier to adoption while also offering an incentive for openness. For example, under the analytic methods (code) sharing standard, authors must state in the text whether and where code is available. Level 2 has stronger expectations for authors but usually avoids adding resource costs to editors or publishers that adopt the standard. In Level 2, journals would require code to be deposited in a trusted repository and check that the link appears in the article and resolves to the correct location. Level 3 is the strongest standard but also may present some barriers to implementation for some journals. For example, the journals Political Analysis and Quarterly Journal of Political Science require authors to provide their code for review, and editors reproduce the reported analyses publication. In the table, we provide “Level 0” for comparison of common journal policies that do not meet the transparency standards.
by Ben Marwick
For most of the history of science, researchers have reported their methods in a way that enabled independent reproduction of their results. But, since the introduction of the personal computer – and the point-and-click software programs that have evolved to make it more user-friendly – reproducibility of much research has become questionable, if not impossible. Too much of the research process is now shrouded by the opaque use of computers that many researchers have come to depend on. This makes it almost impossible for an outsider to recreate their results.
by Simon Hettrick
Recognition of status and career advancement in academia relies on publications. If your skills as a software developer lead you to focus on code to the detriment of your publication history, then your career will come to a grinding halt – despite the fact that your work may have significantly advanced research. This situation is simply not acceptable.
We rely on expert software developers to provide the tools we need for research, and then penalise them for doing so. To become a software developer in academia you must sacrifice your career aspirations, job security, and a salary commensurate to your contribution. This cost is simply too high for most people, and many move to industry where their skills are appreciated and rewarded.
Abstract: Software is increasingly important to the scientific enterprise, and science-funding agencies are increasingly funding software work. Accordingly, many different participants need insight into how to understand the relationship between software, its development, its use, and its scientific impact. In this article, we draw on interviews and participant observation to describe the information needs of domain scientists, software component producers, infrastructure providers, and ecosystem stewards, including science funders. We provide a framework by which to categorize different types of measures and their relationships as they reach around from funding, development, scientific use, and through to scientific impact. We use this framework to organize a presentation of existing measures and techniques, and to identify areas in which techniques are either not widespread, or are entirely missing. We conclude with policy recommendations designed to improve insight into the scientific software ecosystem, make it more understandable, and thereby contribute to the progress of science.
Credit: James Howison, Ewa Deelman, Michael J. McLennan, Rafael Ferreira da Silva and James D. Herbsleb
by Rob J Hyndman
I argue that the open-source model is a much better approach both for research development and for university funding. Under the open-source model, we build software, and put it in the public domain for anyone to use and adapt under a GPL licence. This approach has many benefits that are not always appreciated by university administrators.
Nature Methods | Editorial
Two years ago, we released guidelines for submitting papers describing new algorithms and software to Nature Methods. We have continued to publish a good number of such papers since then.
. . .
First, the traditional review process is not geared toward troubleshooting software. There is no mechanism for referees and authors to communicate except through the editor, and although this does occasionally happen, it is not an efficient process. In the current publishing model this is hard to change, but releasing software via an accepted repository before submission does allow for troubleshooting and will typically not affect consideration at our journal.
by Dr. Frank Seinstra (The Editors in Chief), Prof. David Wallom, Dr. Kate Keahey
SoftwareX aims to contribute to a change of the status quo by supporting the publication of scientific software instruments. Our first objective is to give the software a stamp of scientific relevance and a peer-reviewed recognition of scientific impact. The practical manifestation of this is that the published software becomes citable, allowing traditional metrics of scientific excellence to apply. Our second objective is to give software instrument builders the acknowledgement they deserve so that their academic career paths are supported rather than hindered. In other words, SoftwareX is using a traditional platform for non-traditional scientific output: original software publications.
by Michael Strack
Most of the incentives are stacked against us - we aren’t strongly incentivised to write and share good code, and until this changes things will be difficult. Now is absolutely the moment for you to start making time to get on board with this, because change is coming, ready or not, and we want to bring everyone along with us. There’s a rising tide of support for researcher-specific coding training, both online and in-person - we’re moving away from the traditional model where the researcher coding journey was lonely and isolated.
by Jure Triglav
By building a hub for research software, where we would categorize it and aggregate metrics about its use and reuse, we would be able to shine a spotlight on its developers, show the extent, importance and impact of their work, and by doing so try to catalyze a change in the way they are treated. It won’t happen overnight, and it perhaps won’t happen directly, but for example, if you’re a department head and a visit to our hub confirms that one of your researchers is in fact a leading expert for novel sequence alignment software, while you know her other “actual research” papers are not getting traction, perhaps you will allow her to focus on software. Given enough situations where split-time researchers/software developers are discovered to be particularly impactful in code, it might establish a new class of scientists, scientists dedicated to software development.
by John Cochrane
The solution is pretty obvious: to be considered peer-reviewed "scientific" research, authors should post their programs and data. If the world cannot see your lab methods, you have an anecdote, an undocumented claim, you don't have research. An empirical paper without data and programs is like a theoretical paper without proofs.
Replication is not an issue about which we really can write rules. It is an issue -- like all the others involving evaluation of scientific work -- for which norms have to evolve over time and users must apply some judgement.
by Stephan Lewandowsky & Dorothy Bishop
Transparency has hit the headlines. In the wake of evidence that many research findings are not reproducible, the scientific community has launched initiatives to increase data sharing, transparency and open critique. As with any new development, there are unintended consequences. Many measures that can improve science — shared data, post-publication peer review and public engagement on social media — can be turned against scientists.
Endless information requests, complaints to researchers' universities, online harassment, distortion of scientific findings and even threats of violence: these were all recurring experiences shared by researchers from a broad range of disciplines at a Royal Society-sponsored meeting last year that we organized to explore this topic. Orchestrated and well-funded harassment campaigns against researchers working in climate change and tobacco control are well documented. Some hard-line opponents to other research, such as that on nuclear fallout, vaccination, chronic fatigue syndrome or genetically modified organisms, although less resourced, have employed identical strategies.
by Arjun Raj
My worry, however, is that the strategies for reproducibility that computational types are often promoting are off-target and not necessarily adapted for the needs and skills of the people they are trying to reach. There is a certain strain of hyper-reproducible zealotry that I think is discouraging others to adopt some basic practices that could greatly benefit their research, and at the same time is limiting the productivity of even its own practitioners. You know what I'm talking about: its the idea of turning your entire paper into a program, so you just type "make paper" and out pops the fully formed and formatted manuscript. Fine in the abstract, but in a line of work (like many others) in which time is our most precious commodity, these compulsions represent a complete failure to correctly measure opportunity costs. In other words, instead of hard coding the adjustment of the figure spacing of your LaTeX preprint, spend that time writing another paper. I think it’s really important to remember that our job is science, not programming, and if we focus too heavily on the procedural aspects of making everything reproducible and fully documented, we risk turning off those who are less comfortable with programming from the very real benefits of making their analysis reproducible.
Here are the two biggest culprits in my view: version control and figure scripting.
Abstract: When they seek software for a task, how do people go about finding it? Past research found that searching the Web, asking colleagues, and reading papers have been the predominant approaches---but is it still true today, given the popularity of Facebook, Stack Overflow, GitHub, and similar sites? In addition, when users do look for software, what criteria do they use? And finally, if resources such as improved software catalogs were to be developed, what kind of information would people want in them? These questions motivated our cross-sectional survey of scientists and engineers. We sought to understand the practices and experiences of people looking for ready-to-run software as well as people looking for source code. The results show that even in our highly educated sample of people, the relatively unsophisticated approaches of relying on general Web searches, the opinions of colleagues, and the literature remain the most popular approaches overall. However, software developers are more likely than non-developers to search in community sites such as Stack Overflow and GitHub, even when seeking ready-to-run software rather than source code. We also found that when searching for source code, poor documentation was the most common reason for being unable to reuse the code found. Our results also reveal a variety of characteristics that matter to people searching for software, and thus can inform the development of future resources to help people find software more effectively.
Credit: Michael Hucka, Matthew J. Graham
by Monya Baker
One-third of respondents said that their labs had taken concrete steps to improve reproducibility within the past five years. Rates ranged from a high of 41% in medicine to a low of 24% in physics and engineering.
The survey asked scientists what led to problems in reproducibility. More than 60% of respondents said that each of two factors — pressure to publish and selective reporting — always or often contributed. More than half pointed to insufficient replication in the lab, poor oversight or low statistical power. A smaller proportion pointed to obstacles such as variability in reagents or the use of specialized techniques that are difficult to repeat.
by Gaël Varoquaux
The pinnacle of reproducible research is when the work becomes doable in a students lab. Such progress is often supported by improved technology, driven by wider applications of the findings.
However, not every experiment will give rise to a students lab. Replicating the others will not be easy. Even if the instruments are still around the lab, they will require setting up, adjusting and wiring. And chances are that connectors or cables will be missing.
Software is no different. Storing and sharing it is cheaper. But technology evolves very fast. Every setup is different. Code for a scientific paper has seldom been built for easy maintenance: lack of tests, profusion of exotic dependencies, inexistent documentation. Robustness, portability, isolation, would be desirable, but it is difficult and costly.
Software developers know that understanding the constraints to design a good program requires writing a prototype. Code for a scientific paper is very much a prototype: it’s a first version of an idea, that proves its feasibility.
by Karl Broman
...partially reproducible is better than not at all reproducible. Just try to make your next paper or project better organized than the last.
There are many paths toward reproducible research, and you shouldn’t try to change all aspects of your current practices all at once. Identify one weakness, adopt an improved approach, refine that a bit, and then move on to the next thing.
Abstract: We present a set of computing tools and techniques that every researcher can and should adopt. These recommendations synthesize inspiration from our own work, from the experiences of the thousands of people who have taken part in Software Carpentry and Data Carpentry workshops over the past six years, and from a variety of other guides. Unlike some other guides, our recommendations are aimed specifically at people who are new to research computing.
Credit: Greg Wilson, Jennifer Bryan, Karen Cranston, Justin Kitzes, Lex Nederbragt, Tracy K. Teal
by Brandon Butler
The legal landscape surrounding software is a morass.
Perhaps the most remarkable part of Lowood’s discussion was his account of the relative futility of searching for copyright owners and asking permission. Like others before him, Lowood reported finding very few possible owners, and getting even fewer useful responses. Indeed, software seems to have a special version of the orphan works problem: even when you find a software publisher, they are often unable to say whether they still own the copyright, citing confusing, long-lost, and short-term agreements with independent developers. Lowood said that they could only find putative owners around 25-30% of the time, and, when found, 50% would disclaim ownership.
Abstract: The Astropy Project is, in its own words, "a community effort to develop a single core package for Astronomy in Python and foster interoperability between Python astronomy packages." For five years this project has been managed, written, and operated as a grassroots, self-organized, almost entirely volunteer effort while the software is used by the majority of the astronomical community. Despite this, the project has always been and remains to this day effectively unfunded. Further, contributors receive little or no formal recognition for creating and supporting what is now critical software. This paper explores the problem in detail, outlines possible solutions to correct this, and presents a few suggestions on how to address the sustainability of general purpose astronomical software.
Credit: Demitri Muna et al
Our current dependence on software across the sciences is already significant, yet there are still more opportunities to be explored and risks to be overcome. The academic context is unique in terms of its personnel, its goals of exploring the unknown and its demands on quality assurance and reproducibility.
Society is now in the tricky situation where several deeply established academic fields (e.g., physics, biology, mathematics) are shifting towards dependence on software, programming technology and software engineering methodology which are backed only by young and rapidly evolving fields of research (computer science and software engineering). Full accountability and even validity of software-based research results are now duly being challenged.
Credit: Carole Goble, James Howison, Claude Kirchner, Oscar Nierstrasz, and Jurgen J. Vinju
by Roger Peng
We can pretend that we can make data analyses reproducible for all, but in reality it’s not possible. So perhaps it would make sense for us to consider whether a limiting principle should be applied. The danger of not considering it is that one may take things to the extreme—if it can’t be made reproducible for all, then why bother trying? A partial solution is needed here.
For How Long?
Another question that needs to be resolved for reproducibility to be a widely implemented and sustainable phenomenon is for how long should something be reproducible? Ultimately, this is a question about time and resources because ensuring that data and code can be made available and can run on current platforms in perpetuity requires substantial time and money. In the academic community, where projects are often funded off of grants or contracts with finite lifespans, often the money is long gone even though the data and code must be maintained. The question then is who pays for the maintainence and the upkeep of the data and code?
by Stephen J Eglen, Ben Marwick, Yaroslav O Halchenko, Michael Hanke, Shoaib Sufi, Padraig Gleeson, R Angus Silver, Andrew P Davison, Linda Lanyon, Mathew Abrams, Thomas Wachtler, David J Willshaw, Christophe Pouzat & Jean-Baptiste Poline
Code that already exists, is well tested and documented, and is reused in the analysis should be cited. Ideally, all other code should be communicated, including code that performs simple preprocessing or statistical tests and code that deals with local computing issues such as hardware and software configurations. While this code may not be reusable, it will help others understand how analyses are performed, find potential mistakes and aid reproducibility.
Abstract: Software is often a critical component of scientific research. It can be a component of the academic research methods used to produce research results, or it may itself be an academic research result. Software, however, has rarely been considered to be a citable artifact in its own right. With the advent of open-source software, artifact evaluation committees of conferences, and journals that include source code and running systems as part of the published artifacts, we foresee that software will increasingly be recognized as part of the academic process. The quality and sustainability of this software must be accounted for, both a priori and a posteriori. The Dagstuhl Perspectives Workshop on “Engineering Academic Software” has examined the strengths, weaknesses, risks, and opportunities of academic software engineering. A key outcome of the workshop is this Dagstuhl Manifesto, serving as a roadmap towards future professional software engineering for software-based research instruments and other software produced and used in an academic context. The manifesto is expressed in terms of a series of actionable “pledges” that users and developers of academic research software can take as concrete steps towards improving the environment in which that software is produced.
The personal pledges expressed in this Dagstuhl Manifesto address three general concerns:
(i) ensuring that research software is properly cited; (ii) promoting the careers of research software engineers who develop academic software; and (iii) ensuring the quality and sustainability of software during and following its development:
- I will make explicit how to cite my software.
- I will cite the software I used to produce my research results.
- When reviewing, I will encourage others to cite the software they have used.
- I will recognize software contributions in hiring and promotion within my institution, and encourage others in my institution to do the same.
Development and Use
- I will develop software as open source from the start, whenever possible.
- I will contribute to sustaining software I use and rely on.
- I will match proposed software engineering practices to the actual needs and resources of the project.
- I will help researchers improve the quality of their software without passing judgment.
- I will publish the intellectual contributions of my research software.
- I will document (including usage instructions, and input and output examples), package, release, and archive versions of my software.
Credit: Allen, Alice; Aragon, Cecilia; Becker, Christoph; Carver, Jeffrey; Chis, Andrei; Combemale, Benoit; Croucher, Mike; Crowston, Kevin; Garijo, Daniel; Gehani, Ashish; Goble, Carole; Haines, Robert; Hirschfeld, Robert; Howison, James; Huff, Kathryn; Jay, Caroline; Katz, Daniel S.; Kirchner, Claude; Kuksenok, Katie; Lämmel, Ralf; Nierstrasz, Oscar; Turk, Matt; van Nieuwpoort, Rob; Vaughn, Matthew; Vinju, Jurgen J.
Abstract: Software plays a significant role in modern academic research, yet lacks a similarly significant presence in the scholarly record. With increasing interest in promoting reproducible research, curating software as a scholarly resource not only promotes access to these tools, but also provides recognition for the intellectual efforts that go into their development. This work reviews existing standards for identifying, promoting discovery of, and providing credit for software development work. In addition, it shows how these guidelines have been integrated into existing tools and community cultures, and provides recommendations for future software curation efforts.
Credit: Laura Soito, Lorraine J Hwang
by C. Titus Brown
My conclusion is that, on a decadal time scale, we cannot rely on software to run repeatably.
This connects to two other important issues.
First, since data implies software, we're rapidly moving into a space where the long tail of data is going to become useless because the software needed to interpret it is vanishing. (We're already seeing this with 454 sequence data, which is less than 10 years old; very few modern bioinformatics tools will ingest it, but we have an awful lot of it in the archives.)
Abstract: Software is now a key component present in all aspects of our society. Its preservation has attracted growing attention over the past years within the digital preservation community. We claim that source code—the only representation of software that contains human readable knowledge—is a precious digital object that needs special handling: it must be a first class citizen in the preservation landscape and we need to take action immediately, given the increasingly more frequent incidents that result in permanent losses of source code collections. In this paper we present Software Heritage, an ambitious initiative to collect, preserve, and share the entire corpus of publicly accessible software source code. We discuss the archival goals of the project, its use cases and role as a participant in the broader digital preservation ecosystem, and detail its key design decisions. We also report on the project road map and the current status of the Software Heritage archive that, as of early 2017, has collected more than 3 billion unique source code files and 700 million commits coming from more than 50 million software development projects.
Credit: Roberto Di Cosmo, Stefano Zacchiroli
by Vincent van Hees
Imagine, you invest a lot of time and energy in the development of a piece of scientific software. The work pays off and scientists start to use your software in their research. However, the growing user community also produces a stream of help requests, feature requests, and bug reports. What to do about it?
The ten ways I can think of to keep successful scientific software alive are listed below in no particular order. I wrote this list based on my own experiences from the development and maintenance of R package GGIR, which has been used by researchers who study human physical activity and sleep. These experiences may not perfectly translate to the nature and context of your software, but I hope there are enough generic elements to make these experiences useful for any type of scientific software.
by Jeff Leek
I realized that I see a lot of posts about reproducibility/replicability, but many of them are focused on the technical side. So I started to think about compiling a list of more cultural things we can do to reduce the stress/pressure around the reproducibility crisis.
1. We can define what we mean by “reproduce” and “replicate” Different fields have different definitions of the words reproduce and replicate. If you are publishing a new study we now have an R package that you can use to create figures that show what changed and what was the same betweeen the original study and your new work. Defining concretely what was the same and different will reduce some of the miscommunication about what a reproducibility/replicability study means.
Abstract: A key component of scientific communication is sufficient information for other researchers in the field to reproduce published findings. For computational and data-enabled research, this has often been interpreted to mean making available the raw data from which results were generated, the computer code that generated the findings, and any additional information needed such as workflows and input parameters. Many journals are revising author guidelines to include data and code availability. This work evaluates the effectiveness of journal policy that requires the data and code necessary for reproducibility be made available postpublication by the authors upon request. We assess the effectiveness of such a policy by (i) requesting data and code from authors and (ii) attempting replication of the published findings. We chose a random sample of 204 scientific papers published in the journal Science after the implementation of their policy in February 2011. We found that we were able to obtain artifacts from 44% of our sample and were able to reproduce the findings for 26%. We find this policy—author remission of data and code postpublication upon request—an improvement over no policy, but currently insufficient for reproducibility.
Credit: Victoria Stodden, Jennifer Seiler and Zhaokun Ma
Abstract: Much digital preservation research has evolved around the idea of authentic digital objects and their significant properties. However, the nature of digital preservation work continues to be ill-defined. This paper unpacks definitions of digital objects and their significant properties to deconstruct misleading conflations. I review how the use of the terms digital object and significant properties has evolved in digital preservation, and I identify conceptual inconsistencies. By critiquing the system boundaries assigned by different writers to the term digital objects, I explore the metaphorical nature of the concept and show that the discourse routinely ignores the role of computation in favour of artifact-centred concepts of bits and records. As a consequence, I illustrate category errors around what it means to migrate and preserve digital objects. I suggest a reformulation of both terms based on their metaphorical nature and discuss how this reformulation aligns with insights from research on electronic records and digital preservation. The discussion shows that digital objects are best understood as a metaphorical concept that allows us to articulate the emergent properties of computed performances relying on data, software, and hardware. Significant properties are best understood as mechanisms that allow curators to specify shared understandings of what constitutes authentic reproductions of digital objects. At the core of digital preservation is the design of software-based information systems intended to reproduce authentic digital objects. The article thus contributes to a reframing of the nature of digital preservation and emphasizes the importance of the conceptual frame of computing and systems design in archival education and practice.
Credit: Christoph Becker
by Philip B. Stark
Communicating a scientific result requires enumerating, recording and reporting those things that cannot with advantage be omitted. This harks back to the idea of science as a way to build knowledge through careful experimentation. Ushering in the Enlightenment era in the late seventeenth century, chemist Robert Boyle put forth his controversial idea of a vacuum and tasked himself with providing descriptions of his work sufficient “that the person I addressed them to might, without mistake, and with as little trouble as possible, be able to repeat such unusual experiments”.
Much modern scientific communication falls short of this standard. Most papers fail to report many aspects of the experiment and analysis that we may not with advantage omit — things that are crucial to understanding the result and its limitations, and to repeating the work.
Abstract: Context: Scientific software plays an important role in critical decision making, for example making weather predictions based on climate models, and computation of evidence for research publications. Recently, scientists have had to retract publications due to errors caused by software faults. Systematic testing can identify such faults in code.
Objective: This study aims to identify specific challenges, proposed solutions, and unsolved problems faced when testing scientific software.
Method: We conducted a systematic literature survey to identify and analyze relevant literature. We identified 62 studies that provided relevant information about testing scientific software.
Results: We found that challenges faced when testing scientific software fall into two main categories: (1) testing challenges that occur due to characteristics of scientific software such as oracle problems and (2) testing challenges that occur due to cultural differences between scientists and the software engineering community such as viewing the code and the model that it implements as inseparable entities. In addition, we identified methods to potentially overcome these challenges and their limitations. Finally we describe unsolved challenges and how software engineering researchers and practitioners can help to overcome them.
Conclusions: Scientific software presents special challenges for testing. Specifically, cultural differences between scientist developers and software engineers, along with the characteristics of the scientific software make testing more difficult. Existing techniques such as code clone detection can help to improve the testing process. Software engineers should consider special challenges posed by scientific software such as oracle problems when developing testing techniques.
Credit: Upulee Kanewala, James M. Bieman
by Erika Pastrana and Sowmya Swaminathan
... three Nature journals—Nature Methods, Nature Biotechnology and Nature Machine Intelligence—will run a trial in partnership with Code Ocean to enable authors to share fully-functional and executable code accompanying their articles and to facilitate peer review of code by the reviewers.
Abstract: Scientific discovery is mediated by ideas that, after being formulated in hypotheses, can be tested, validated, and quantified before they eventually lead to accepted concepts. Computer-mediated discovery in astrophysics is no exception, but antiquated code that is only intelligible to scientists who were involved in writing it is holding up scientific discovery in the field. A bold initiative is needed to modernize astrophysics code and make it transparent and useful beyond a small group of scientists.
Credit: Simon Portegies Zwart