This paper presents an approach to developing Composite Web Services Marts (CWS-Marts). A CWS-Mart gathers ready-to-use composite Web services that users can invoke any time without going from scratch through the regular steps of discovering, selecting, and composing the necessary component Web services. In addition, this paper presents an architecture that encompasses four levels namely component, community, composite, and mart. The component and composite levels set respectively the ground upon which the community and mart levels are deployed. Similar to communities that gather similarly-functional Web services, CWS-Marts gather similarly-functional composite Web services. Some experimental details are, also , discussed in the paper. © 2010 IEEE.