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The group protocol supports applications with enough quality of service (QoS) in change of QoS supported by the underlying network and required by applications. A flexible group service is supported for applications by cooperation of multiple autonomous agents. Each agent dynamically and autonomously takes a class of each protocol function like retransmission. The classes taken by an agent is consistent with the other agents, which might be different from the others. A group is composed of views in each of which agents autonomously take protocol classes which might be different from the other agents but are consistent.