DAVID LAVALLEE Head of the Department of Sport and Exercise at Aberystwyth, University of Wales, UK. His principal areas of interest include self identity and coping processes in sport and exercise, psychology of sport injury, retirement from sport, athlete and coach burnout and eating disorders in sport. JOHN KREMER Reader in Applied Social Psychology at Queen's University, Belfast, Northern Ireland. He is Module Co-ordinator fornbsp;Social and Applied Psychologynbsp;and Sport and Exercise Psychology. His research interests include: equality and diversity at work and sport and exercise psychologynbsp;nbsp; AIDAN MORAN Professornbsp;of Cognitive Psychology in the School of Psychology at University College, Dublin, Ireland. He has published extensively in cognitive psychology (mental imagery, eye-tracking) and sport psychology (mental practice, concentration) and is particularly interested in the use of psychological techniques to improve people's concentration skills and performance. A consultant to many of Ireland's leading professional sports performers and teams, he is a former Official Psychologist to the Irish Olympic Squad. MARK WILLIAMS Professor of Motor Behaviour at Liverpool John Moores University, UK,nbsp;and Visiting Research Associate at Florida State University, USA. Professor Williams' current research concentrates on 'the medical decision-making skill in healthcare and medicine'.