In this paper, we propose a feedback based framework for semi-automatic composition of Web services. In the framework, whenever a service process is constructed by composing Web services, the connection patterns of Web services in the service process are analyzed and registered in terms of data and control flows. Also a method of measuring the degree of coupling between Web services is devised within the framework. Semi-automatic composition of Web services is possible in the framework because the framework can recommend which Web services are more tightly coupled with each other using the method. When one highlights a Web service in a service domain, the next and the previous connectable Web services are listed according to the degree of coupling with the Web services.