Preface:Proceedings of the 8th International Workshop on OCL Concepts and Tools (OCL 2008) at MoDELS 2008

This document reports on the 8th OCL workshop held at the MODELS conference in 2008. The workshop focussed on how to evaluate, compare and select the right OCL tools for a given purpose and how to deal with the expressiveness and complexity of OCL. The workshop included sessions with paper presentations as well as a special tool demo session.