In this paper we address the problem of coalition formation in hedoniccontext. Our modelling tries to be as realistic as possible. In previousmodels, once an agent joins a coalition it would not be able to leave thecoalition and join the new one; in this research we made it possible to leave acoalition but put some restrictions to control the behavior of agents. Leavingor staying of an agent in a coalition will affect on the trust of the otheragents included in this coalition. Agents will use the trust values incomputing the expected utility of coalitions. Three different risk behaviorsare introduced for agents that want to initiate a coalition. Using these riskbehaviors, some simulations are made and results are analyzed.
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