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This is one suggested model, note that (P)PMCs have some leeway in the way decisions are made, where vetoes apply etc., see https://httpd.apache.org/dev/guidelines.html and http://couchdb.apache.org/bylaws.html#decisions for good examples of that. For CouchDB note that nowadays the term "community guidelines" is preferred over bylawxsbylaws.
Different decisions require different forms of approval but community consensus is always the goal. Voting when needed, should be open for at least 72 hours.
- Consensus Approval – Consensus approval requires 3 binding +1 votes and no -1 votes (vetoes).
- Majority Approval – requires Requires at least 3 binding +1 votes more +1 votes than -1 votes.
- Lazy Consensus – consensus Consensus no objections (‘silence gives assent’).
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1 Notice must be given to board, or if a podling the IPMC.
2 Except PMC member in question. Only the board can remove PMC members.
3 Needs to be approved by the board at the next board meeting.
4 While most project projects vote on new committers it's up to the PPMC to decide how to do it.