Behaviour Therapy is based on the application of principles of learning. to change human behaviour. In the last two decades it has grown into a promising. scientific discipline. This development is exemplified by extensive research and. applications. The present book provides a unifying account of its contemporary. developments, linking underlying theories with practice. This book is divided into three sections. In the first section, basic assumptions. of behaviour therapy are examined and emerging trends such as radical behaviourism, . cognitive behaviourism and systematic eclectism are dealt.