This book presents the thoroughly refereed post-conference proceedings of the 11th Australian Joint Conference on Artificial Intelligence, AI'98, held in Brisbane, Australia in July 1998. The 28 revised full papers presented in the book were carefully reviewed and selected from twice as many papers accepted for presentation at the conference. Among the topics covered are philosophical issues, fuzzy logic, agent systems, AI logics, planning, knowledge representation, automated deduction, intelligent agents, learning, constraint solving, and neural networks.