Abstract: As software trustworthiness has become an important aspect in software engineering research, more and more researchers have focused on Web service trustworthiness evaluation while Web service has been the main form in soft- ware resource. Current research about Web service trustworthiness has concentrated on QoS attributes evaluation of single service rather than on Web service composition trustworthiness evaluation. This paper presented a general model of atomic service trustworthiness evaluation and an approach for composite service trustworthiness evaluation based on the weight of atomic services executed in composite service and the structure of composite service. Finally, we described the experiment of the approach by using a detailed case in a real online shopping.

Key words: Web service composition, Trustworthiness evaluation, Evaluation model