关键词: 组合Web服务, 服务价值, 价值期望, 状态转换, 价值分析

Abstract: To judge whether the atomic service and its Quality of Service (QoS) in composite service affected the fully realization of customers value proposition,the value analysis of composite Web service was researched.The value proposition and measurement method for composition Web services based on state-transition were presented.The function and QoS provided by composition service were regarded as the constraints of value proposition,and the corresponding value decision methods were researched,as well as the analysis methods of responsibility point,Degree of Criticality (DoC) and Degree of Sensitivity (DoS) for each atomic Web service (and its QoS parameters) were proposed,which was aimed at finding the defects hindered the fully implementation of value propositions and providing foundations for the future optimization of composite Web services.A case study was inducted to valid the effectiveness of the proposed method.

Key words: composite Web service, service value, value proposition, state transition, value analysis