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SELF-SERV distinguishes three types of services: elementary services, composite services, and service communities. An elementary service is an individual Web accessible application (for example, a Java program) that does not explicitly rely on another Web service. A composite service aggregates multiple Web services that are referred to as its components. SELF-SERV relies on a declarative language for composing services based on state charts: a widely used formalism in the area of reactive systems that is emerging as a standard for process modeling following its integration into the Unified Modeling Language (UML). An operation of a composite service can be seen as having input parameters, output parameters, consumed and produced events, and a state chart gluing these elements together. The technology to compose Web services in appropriate time frames has not kept pace with …