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Unlike other Foundation bodies, the ESCo has a quorum, defined as ⅔ of the occupied ESCo Project Lead seats, rounded up. So when all 5 of the ESCo Project Lead seats are occupied (the typical case), quorum is 4.
Email votes are not valid unless considered to have "failed" (i.e. to have failed to reach a decision, either way) if the number of valid responses from ESCo Project Leads meets or exceeds quorum, and indoes not meet quorum. In-person votes (see below) cannot have this outcome since they cannot be initiated unless a quorum is present (see below).
Voting Eligibility
Only ESCo members can initiate a vote; votes that are requested by other bodies (e.g. an incubating working group that is requesting ratification) are initiated by the ESCo Secretary on behalf of that body.
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