The increasing popularity of Web services for application integration has strengthened the need for automated Web services composition. For this automation to succeed, the joint execution of Web services requires to be coordinated. Coordination's main use is to solve conflicts between Web services. Conflicts could be on sharable resources, order dependencies, or communication delays. The proposed coordination model tackles these conflicts with three inter-connected blocks defined as conflict, exception, and management. Conflicts among Web services raise exceptions that are handled using appropriate mechanisms as part of the coordination model.