We describe three possible levels and mechanisms for social relationship among agents. First, there is the level of negotiated commitment, by which agents by agreement mutually constrain their behavior to provide social coherence. Second, we describe how our agent model can be used to model nmtual control among agents at different cognitive levels. This uses a parallel and modular agent architecture we have designed and implemented and which is based on blackboard ideas and inspired by the primate brain. Third, we discuss the concept of mutual regulation which operates at the level of resources.