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negotiation rules (IV)
•rules for lifecycle of negotiation
•responsible role: negotiation terminator
–termination rule: specifies when no more proposals may be posted (e.g. a given time, period of quiescence)
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•rules for agreement formation
•responsible role: agreement maker
–agreement formation rules: determine, given a  set of proposals of which at least two are compatible, which agreements should be formed
–tie-breaking rule: specific agreement formation rule applied after all others