This conference has become a major annual forum in Ireland for the presentation and discussion of current research work in the multidisciplinary area of artificial intelligence. The aim of the AICS '90 conference was to provide a forum for industry and academic research to discuss AI and AI-related topics. Each paper presents new research results within its own specific area. This book of proceedings on computer science, artificial intelligence, cognitive science, psychology and linguistics is intended for researchers in industry and academia and postgraduate students.