this book constitutes the thoroughly refereed post-proceedings of the 16th international workshop on algebraic development techniques, wadt 2002, held at frauenchiemsee, germany in september 2002. the 20 revised full papers presented together with 6 invited papers were carefully improved and selected from 44 workshop presentations during two rounds of reviewing. the papers are devoted to topics like formal methods for system development, specification languages and methods, systems and techniques for reasoning about specifications, specification development systems, methods and techniques for concurrent, distributed, and mobile systems, and algebraic and co-algebraic methods.