The CLCM 2.0 of the Sontheim Industrie Elektronik GmbH is a centralized system for managing and authoring the diagnostic and communication description of ECUs and complete vehicles. It is a clientserver-based web application that allows several users to work collaboratively on the same project. There is no client installation necessary and the server can be accessed from different platforms via browser. The CLCM 2.0 can be integrated in the existing infrastructure and development workflow. It is intended to accompany the whole development process of ECUs or vehicles.