Available at: https://www.linuxfoundation.org/resources/open-source-guides/
 Available at: https://opensource.guide/
 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
 GitHub, “Forking Projects”. More information: https://guides.github.com/activities/forking/#:~:text=After%20using%20
 IGI Global, “What is Open Source Community”. More information: https://www.igi-global.com/dictionary/collaborative-development-
 Opensource.com, “What is open source?”. More information: https://opensource.com/resources/what-open-source and https://
 BBC, “Software concepts”. More information: https://www.bbc.co.uk/bitesize/guides/z6r86sg/revision/4
 Investopedia, “Software-as-a-Service (Saas)”. More information: https://www.investopedia.com/terms/s/software-as-a-service- saas.asp
 Gartner Glossary, “Total Cost of Ownership”. More information: https://www.gartner.com/en/information-technology/glossary/total-cost-of-ownership-tco
 The LINUX information project, “Vendor Lock-In Definition”. More information: http://www.linfo.org/vendor_lockin.html
 There are many OSI approved licenses but each one differs in the degree of openness, reciprocity obligations and restrictions.
If there is a choice in licence, then the more reciprocal obligations will ensure community engagement and
sustainability. If monetary returns are the more pressing concern, then a less reciprocal license will be effective.
 Please refer to Terms and Definitions section for a definition of this term.
 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.
 According to our survey respondents.
 54% of our survey respondents consider a clearly defined budget as a ‘very important’ or an ‘important’ sustainability factor.
 Hiring developers was seen as a ‘very important’ factor by 47% and as an ‘important’ factor by 22% of our survey respondents.
 The State Secretary of the Interior and Kingdom Relations outlined the policy “open, unless” (“Open, tenzij”) in his letter sent to the House of Representatives on 17 April 2020.
 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).
 Taken and adapted from: Open Source Leadership and Governance Guide and Red Hat’s Guide to open source project governance models.
 Public Digital (2021), Open source in government: creating the conditions for success. Available at https://public.digital/
 45% of our survey respondents deem a community’s capacity to attract new members as a ‘very important’ or ‘important’ sustainability factor.
 64% of our survey respondents highlighted the importance of communication in the sustainability of an open source project.
 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.
 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.
 Our research shows transparency of the decision-making hierarchy to be a factor strongly influencing OSS contributors’ motivation.
 43% of our survey respondents view the presence of coordination mechanisms among community members as a very important factor to its sustainability.
 Community’s vision states what the community wants to achieve in the future.
 Community’s mission states the purpose of the community.
 Overall, 41% of our survey respondents believed community guidelines to be very important and 41% an important factor for sustainability.
 Singh et al (2021), Codes of conduct in Open Source Software—for warm and fuzzy feelings or equality in community?, Software Quality Journal, available at: https://www.springerprofessional.de/en/codes-of-conduct-in-open-source-software-for-warm-and-fuzzy-feel/18912452
 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.