This book includes selected papers of the First International Workshop on Model-Based Software and Data Integration 2008, held in Berlin, Germany, in April 2008 as a part of the Berlin Software Integration Week 2008. The 9 revised full papers presented together with 3 invited lectures were carefully reviewed and selected from numerous submissions. The papers are organized in topical sections on data integration, software architectures, services and migration, as well as on model-based and semantic approaches.