References contained in the Guidelines

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[1] Available at: https://www.linuxfoundation.org/resources/open-source-guides/

[2] Available at: https://opensource.guide/

[3] The Sharing and Reuse Action is part of the European Commission’s ISA2 programme. More information is available at: https:// ec.europa.eu/isa2/actions/promoting-sharing-and-reuse-interoperability-solutions_en

[4]  GitHub, “Forking Projects”. More information: https://guides.github.com/activities/forking/#:~:text=After%20using%20
GitHub%20by%20yourself,contribute%20to%20someone%20else’s%20project.&text=Creating%20a%20%E2%80%9Cfork%
E2%80%9D%20is%20producing,repository%20and%20your%20personal%20copy.

[5] IGI Global, “What is Open Source Community”. More information: https://www.igi-global.com/dictionary/collaborative-development-
environments/21213

[6] Opensource.com, “What is open source?”. More information: https://opensource.com/resources/what-open-source and https://
opensource.org/osd

[7] BBC, “Software concepts”. More information: https://www.bbc.co.uk/bitesize/guides/z6r86sg/revision/4

[8] Investopedia, “Software-as-a-Service (Saas)”. More information: https://www.investopedia.com/terms/s/software-as-a-service- saas.asp

[9] Gartner Glossary, “Total Cost of Ownership”. More information: https://www.gartner.com/en/information-technology/glossary/ total-cost-of-ownership-tco

[10] The LINUX information project, “Vendor Lock-In Definition”. More information: http://www.linfo.org/vendor_lockin.html

[11] Please refer to Terms and Definitions section for a definition of this term.

[12] Our research shows that having political support for any type of OSS project is a pre-requisite for a sustainable public sector OSS project. More specifically, 62% of our survey respondents believe the support of the political level is a ‘very important’ factor in the sustainability of any community.

[13] According to our survey respondents

[14] 54% of our survey respondents consider a clearly defined budget as a ‘very important’ or an ‘important’ sustainability factor.

[15] Hiring developers was seen as a ‘very important’ factor by 47% and as an ‘important’ factor by 22% of our survey respondents.

[16] Our survey highlighted the importance of having a clear governance structure. Indeed, survey respondents underlined the importance of having a clear leadership structure (74% of respondents) and clearly defined roles and responsibilities (76% of respondents).

[17] Taken and adapted from: Open Source Leadership and Governance Guide and Red Hat’s Guide to open source project governance models.

[18] 45% of our survey respondents deem a community’s capacity to attract new members as a ‘very important’ or ‘important’ sustainability factor.

[19] 64% of our survey respondents highlighted the importance of communication in the sustainability of an open source project.

[20] According to our survey respondents, the community’s capacity to attract new members and retain current members are key sustainability factors, deemed as ‘very important’ by 46% and 53% of our survey respondents respectively

[21] 61% of our survey respondents consider that documentation is an important element of the sustainability of the open source project. Some of our interviewees even believe that 50% of developers’ time should be dedicated to documentation.

[22] Our research shows transparency of the decision-making hierarchy to be a factor strongly influencing OSS contributors’ motivation.

[23] 43% of our survey respondents view the presence of coordination mechanisms among community members as a very important factor to its sustainability.

[24] Community’s vision states what the community wants to achieve in the future.

[25] Community’s mission states the purpose of the community.

[26] Overall, 41% of our survey respondents believed community guidelines to be very important and 41% an important factor for sustainability.

[27] 72% of our survey respondents deem the ability to get credit for one’s contribution to an open source community as a ‘very important’ or ‘important’ sustainability factor.