Nomothetic and idiographic

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In the study of psychology, idiographic describes the study of the individual, whereas nomothetic is more the study of a cohort of individuals.

Nomothetic and idiographic are terms coined by Kantian philosopher Wilhelm Windelband to describe two distinct approaches to knowledge, each one corresponding to a different intellectual tendency, and each one corresponding to a different branch of academe.

Nomothetic is based on what Kant described as a tendency to generalize, and is expressed in the natural sciences. It describes the effort to derive laws that explain objective phenomena.

Idiographic is based on what Kant described as a tendency to specify, and is expressed in the humanities. It describes the effort to understand the meaning of contingent, accidental, and often subjective phenomena.

Usually, nomothetic approaches are quantitative, and idiographic approaches are qualitative, although the "Personal Questionnaire" developed by M.B. Shapiro, and its further developments (e.g. Discan scale) are both quantitative and idiographic.

In sociology, nomothetic explanation presents a generalized understanding of a given case, and is contrasted with idiographic explanation, which presents a full description of a given case.

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