In August, 1985, the 2nd International Conference on Illness Behaviour was held in Toronto, Ontario, Canada. The first International Conference took place one year previous in Adelaide, South Australia, Australia. This book is based on the proceedings of the second conference. The purpose behind this conference was to facilitate the development of a single integrated model to account for illness experience and presentation. A major focus of the conference was to outline methodological issues related to current behaviour research. A multidiscipl~nary approach was emphasized because of the bias that collaborative efforts are likely to be the most successful in achieving greater understanding of illness behaviour. Significant advances in our knowledge are occurring in all areas of the biological and social sciences, albeit more slowly in the latter areas. Marked specialization in each of these areas has lead to greater difficulty in integrating new knowledge with that of other areas and the development of a meaningful cohesive model to which all can relate. Thus there is a major need for forums such as that provided by this conference.