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An autonomic group protocol supports applications with enough quality of service (QoS) in change of QoS supported by networks and applications. An autonomic group service is supported for applications by cooperation of multiple autonomous agents. Each agent autonomously takes a class of each protocol function like retransmission. Classes taken by an agent are required to be consistent with but might be different from the others. A group is composed of views each of which is a subset of agents and in each of which agents autonomously take protocol classes consistent with each other. We discuss a model of autonomic group protocol. We also present how to autonomously change retransmission ways in a group as an example.