Integration of heterogeneous applications offers many benefits; as a consequence, the goal is not to try and eliminate the heterogeneity, but to help developers to master it and manage it. There have been many approaches to integrate heterogeneous technologies in the context of the Web. Most of them cannot provide a common solution because they try to solve the problem using an incomplete set of proprietary technologies. To establish a holistic, commonly accepted and standardised approach would be preferable. This paper presents a case study for the development of an integration framework in the area of collaborative work environments. This framework is based on REST Web services, and has been designed and implemented as part of the Laboranova European project.