Thank you @StephaneLacrampe for the feedback.
Every methodology has its guru/s who is/are the referring persons to own its consistency and evolution.
Who is the Arcadia (not Capella) 's guru so I could propose enhancement ideas?
I guess you should contact Thales through these contact emails: Capella - Thales
Thank you Stéphane. The only names I see in the available Arcadia documents is Jean-Luc Voirin.
As Capella is the public domain, maybe Arcadia should be open source too?
Capella is not in the public domain. It is distributed as open-source software under the Eclipse Public License 2.0 (EPL-2.0). This licence keeps copyright with the contributors (and is stewarded by the Eclipse Foundation) while granting everyone the right to use, study, modify and redistribute the code under EPL terms. By contrast, a work in the public domain has had all rights waived—so Capella is open-source, but not public-domain.
Regarding the Arcadia methodology, my (non-lawyer’s) understanding is that it was developed at Thales (around 2005–2010) and is described in several freely downloadable PDFs as well as Jean-Luc Voirin’s book. A concise version is also published as AFNOR experimental standard XP Z67-140. None of these materials, as far as I know, have been released under an open-content licence: Thales currently distributes them as “free-to-download, all-rights-reserved” documents. That arrangement lets anyone apply Arcadia, but redistributing or modifying the official texts still requires Thales’ permission.
As to whether Arcadia should become open-source, my personal view is cautious. For software like Capella, the Eclipse ecosystem provides proven open-source governance; for a methodology, formal standards bodies such as AFNOR may be better suited to managing controlled evolution and ensuring long-term stability. Ultimately, however, that decision rests with Thales.
For a definitive position, I recommend contacting Thales directly via the addresses I shared earlier, they may offer a perspective different from mine.
Thank you Stéphance for your detailed explanations of the current situation for Arcadia and Capella.
Indeed, it would be great to have Thales’s view of making Arcadia open-source.
If I contact Thales as a little freelancer, I know the answer if there is an answer.
Why don’t we start a new thread in this forum so the whole Arcadia community but also Thales discuss the pros and cons of making Arcadia open-source?
For all readers of this post, could you please let us know if you want to have this discussion here by liking this post.