PAUL BRNA is Reader in Interactive Learning Systems in the Computer Based Learning Unit at the University of Leeds./e Paul works on the applications of Artificial Intelligence to Education, including research into the interpretation and use of external representations and narrative in collaborative program construction and debugging.BENEDICT DU BOULAY is Professor of Artificial Intelligence Subject Group within the School of Cognitive and Computer Sciences. He is a member of the Human Centred Technology Research Group working in the areas of Artificial Intelligence in Education and the Psychology of Programming, University of Sussex.HELEN PAIN is Senior Lecturer at the Division of Informatics, University of Edinburgh.