Book excerpt: This book constitutes the thoroughly refereed post-proceedings of the 8th International Bi-Conference Workshop on Agent-Oriented Information Systems, AOIS 2005, held in Hakodate, Japan, May9, 2006 and Luxembourg, Luxembourg, June 6, 2006. The 13 revised full papers presented have gone through two rounds of reviewing and improvement and were carefully selected for inclusion in the book. The papers are organized in topical sections on Modelling, Methodologies, Agent-oriented Software Engineering, and Applications.