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Lewin's equation, ''B'' = ''f''(''P'', ''E''), is a heuristic formula proposed by psychologist Kurt Lewin as an explanation of what determines behavior. ==Description== The formula states that behavior is a function of the person and his or her environment:〔( The Sage Handbook of Methods in Social Psychology ): Lewin's equation〕 Where is behavior, is Person, and is the environment. This equation was first presented in Lewin's book, ''Principles of Topological Psychology'', published in 1936.〔(Christian Balkenius (1995). ''Natural Intelligence in Artificial Creatures''. Lund University Cognitive Studies 37. ) (ISBN 91-628-1599-7): Chapter 4 – Reactive Behavior〕 The equation was proposed as an attempt to unify the different branches of psychology (e.g. child psychology, animal psychology, psychopathology) with a flexible theory applicable to all distinct branches of psychology. This equation is directly related to Lewin's field theory. Field theory is centered around the idea that a person's life space determines their behavior.〔 Thus, the equation was also expressed as ''B = f''(''L''), where ''L'' is the life space. In Lewin's book, he first presents the equation as ''B'' = ''f''(''S''), where behavior is a function of the whole situation (''S''). He then extended this original equation by suggesting that the whole situation could be roughly split into two parts: the person (''P'') and the environment (''E''). According to Lewin, s''ocial'' behavior, in particular, was the most psychologically interesting and relevant behavior. Lewin held that the variables in the equation (e.g. ''P'' and ''E'') could be replaced with the specific, unique situational and personal characteristics of the individual. As a result, he also believed that his formula, while seemingly abstract and theoretical, had distinct concrete applications for psychology.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Lewin's equation」の詳細全文を読む スポンサード リンク
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