Encyclopaedia of Behavioural Science deals with the subject areas of behavioural science in its totality. The publication is purposely made user-friendly, so that it truly serves the purpose of becoming a reference work. In general, behavioural science studies human beings through examination of their behaviour in the broad sense, putting emphasis on the process of behaviour rather than its products. In this process, the primary task of philosophy is to open a new field for each science to explore by discerning structures in the unmapped areas of our thinking. This encyclopaedia helps explain the nature of psychology as a contemporary science, discuss psychological issues intelligently and methodically, and describe both the contributions and limitations of psychological science and the promise of the future of the field and its attendant problems. It further explains the role played by the scientific method in the acquisition of knowledge about the basic principles of human and animal behaviour. It identifies the principles that govern human and animal behaviour and apply these principles to their own lives to enhance interactions between individuals and among societal groups. This encyclopaedia is of great contemporary relevance.