This book constitutes the thoroughly refereed post-conference proceedings of the 15th International SDL Forum, SDL 2011, held in Toulouse, France, in July 2011. The 16 revised full papers presented together were carefully reviewed and selected for inclusion in the book. The papers cover a wide range of topics such as SDL and related languages; testing; and services and components to a wide range presentations of domain specific languages and applications, going from use maps to train station models or user interfaces for scientific dataset editors for high performance computing.