Abstract. The development of software is not an easy task and the availability of adequate tool support is an important step towards reducing the effort that a developer must put into the Software Development Cycle. As an emerging technology, it is vital that Semantic Web Services can be quickly and easily created by developers to ensure that this new technology can be easily adopted. In this demo the process of developing Semantic Web Service descriptions, through the WSMO paradigm, using the Web Service Modeling Toolkit (WSMT) will be presented.