"Behavioural Activation" is a comprehensive work that addresses the theory of behavioral activation. This theory posits that many clinically relevant human behaviors are influenced by positive reinforcement. When this positive reinforcement is diminished, lost, or chronically low, it can lead to depression. The book provides a clear and concise presentation of the fundamental theoretical and practical aspects of behavioral activation. It is aimed at mental health professionals as well as students who wish to develop a deeper understanding of the mechanisms of behavioral activation and its application in therapy. With 200 pages in English, the book offers both theoretical foundations and practical guidance for effectively implementing the principles of behavioral activation in clinical practice. It is a valuable reference for anyone involved in the treatment of depression and other affective disorders.