ABSTRACT 

Mobile Agent "MA" paradigm is said to give better performance advantages over other paradigms due to its

features especially in the network and the internet applications. To integrate mobile agents into such applications,

fault tolerant ability of an agent is one of the most important issues. In this paper we propose the Fault Tolerant

Mobile Agent execution System “FTMAS” mathematical model. The paper states and defines the migration time, the

Round trip time, the transfer time and the system throughput. They are defined relative to 3 performance metrics: the

average connectivity of the network, the agent size and the probability of failure. The mathematical model of the

FTMAS is stated as a promising model in the fault tolerant field of the Mobile Agent execution. In addition, a novel

failure classification is stated to solve agent faults efficiently.