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Mobile agents (MAs) are being widely used in distributed applications development. The motivation behind the interest in MAs is derived from the various advantages they offer, such as, autonomous behavior, mobility and intelligence. Also, their small size and requirement of a low bandwidth are other attractive features. However, the dynamic behavior of agents and hosts in Mobile Agent Systems (MASs) has posed a challenging problem. Maintaining good performance is important for MASs to guarantee the quality of provided services. To address both of these issues we propose a new adaptive trust and reputation model for MASs. The proposed model provides users with the means to assess service providers and decision making basis on who to interact with. It combines direct and indirect witnesses' experience evaluations. It also assesses the honesty of witnesses to filter out false evaluations. In addition, new …