This theory emerged in the late 1940s and was one the first family-focused theories with a separate identity from psychology or sociology. Evelyn Duvall was a major contributor.

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Family Developmental Theory, with significant contributions from Evelyn Duvall, emerged in the late 1940s as one of the first theories to focus specifically on the family as a unit with its own developmental processes, distinct from the broader fields of psychology or sociology.

This Theory Emerged in the Late 1940s and Was One