This book constitutes the thoroughly refereed post-proceedings of the First International Workshop on Programming of the First International Workshop on Programming Multi-Agent Systems, PROMAS 2003, held in Melbourne, Australia in July 2003 as part of AAMAS 2003. Besides 8 workshop papers, the volume contains 3 invited papers to complete coverage of the relevant aspects. The papers are organized in topical sections on programming multi-agent systems, languages for multi-agent systems, and principles and tools for multi-agent systems.