Abstract
To secure the consistency and integrity of extended multiagent actions, we subsume them under the transaction abstraction. Deontic logic, the logic of normative reasoning is used to develop a transaction model for multiagent systems. Obligations are seen as arising from speech acts of the agents in the transaction, and they structure the transaction into a hierarchy of subtransactions. A prima facie obligation is one that binds unless overridden by another obligation. We emphasize such defeasibility of obligations and exploit Y.U. Ryu's (1995; 1997) defeasible deontic logic. Our model accounts for the flexibility and fault tolerance of multiagent systems, the autonomy of agents, and the importance of negotiation.
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