# Lewin's equation

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Lewin's equation, B = f(PE), is not actually a mathematical equation representing quantifiable relationships but rather a heuristic formula designed by psychologist Kurt Lewin.

## Description

The formula states that behavior is a function of the person and his or her environment:[1]

$B=f(P,E)$

Where $B$ is behavior, $P$ is Person, and $E$ is the environment.

The equation is the psychologist's most well known formula in social psychology, of which Lewin was a modern pioneer. When first presented in Lewin's book Principles of Topological Psychology, published in 1936, it contradicted most popular theories in that it gave importance to a person's momentary situation in understanding his or her behavior, rather than relying entirely on the past.[2]