Web Services (WS), a currently popular subject among application developers, IT architects, and researchers, can be defined as a technology for publishing, identifying and calling services in a network of interacting computer nodes. The purpose of this paper is to illustrate the benefits of using patterns as a means of managing knowledge concerning security in the context of Web Services. We draw upon experiences from an industrial project in which a pattern catalogue for Web Services was created. The pattern catalogue consists of 29 patterns, which are generic solutions for service-based development and service-oriented architectures. In particular, Web Services are in focus as the enabling technique.