关键词: 虚拟组织, 服务协同, 异常依赖, 准则, 异常处理

Abstract: For enhancing the reliability of service cooperation and simplifying the design process of exception handling，this paper introduces the supporting mechanism of double-layer norm-governed service cooperation into the virtual organization.In order to make the service consistent and reliable，it forms a dependence relation of exception at the function-norm layer through the dependence relation of service operations and then uses it to guide the supporting-norm layer to handle exception.It first gives out the definition of norm，and then illuminates an algorithm of forming the dependence relation of exception automatically and steps of exception handling.An example analysis is presented to explain this mechanism at the last part.

Key words: virtual organization, service cooperation, exception dependence, norm, exception handling