Hi Christophe,
Thank you for these interesting emails. I'm cc'ing Anasuya on this discussion with the hope that what you've learned can be disseminated to other Wikimedia affiliates, especially new or aspiring chapters.
Is the decision matrix that you use for your programs available in English? I would like to have a copy of it on Meta along with these emails.
I am interested in this subject partly because of the discussion about WMF's Annual Plan and partly because there are occasional discussions about forming a new thematic organization or chapter in my region.
Thanks,
Pine