There are emerging technologies such as SAWSDL or WSMO that extend the current Web Services technologies to so called Semantic Web Services by combining the structural and semantic descriptions of Web services. In this paper, we identify problems that can arise when using these technologies for the design and management of Semantic Web Services and we show that using a conceptual model instead of these technologies can help to solve these problems. We also show how to automatically derive the description of Semantic Web Services represented with existing technologies, concretely with SAWSDL, from the conceptual level because this representation brings other advantages. Categories and Subject Descriptors H.3.5 [On-line Information Services]: Web-based services; D.2.12 [Interoperability]: Data mapping General Terms Semantic Web Services Keywords grounding, conceptual modelling, data transformation