Description:This book constitutes the thoroughly refereed post-proceedings of the 7th Pacific Rim International Workshop on Multi-Agents, PRIMA 2004, held in Auckland, New Zealand in August 2004 in conjunction with PRICAI 2004. The 24 revised full papers presented went through two rounds of reviewing and improvement and were selected from 52 submissions. The papers address many current topics in multi-agent research and development, ranging from theoretical and methodological issues to various applications in different fields.