Mapping guidelines for a Web service's behavior can ensure an individual Web service's smooth engagement on a composite Web service, which are combinations of Web services. Developing a composite Web service requires a specification that shows elements such as the component Web services' execution order, the data dependencies among the component Web services. The developers and deployers can use the policies defined for Web services composition to manage Web services at both high and low levels. Adopting policies also introduces the possibility of changing Web services' behavior without altering a composition specification. The Web service deployers can continuously adjust multiple aspects such as Web services' conflict-resolution mechanisms to accommodate variations in the environment.