An in-depth investigation of a single individual, group, event, or situation to understand complex phenomena. Provides detailed, qualitative insights but limited generalizability.
From Latin 'casus' (a fall, occurrence) and 'studium' (eagerness, devotion to learning). 'Case' evolved from meaning 'what befalls someone' to 'instance or example,' while legal usage in the 1600s established the pattern of examining individual cases for broader understanding.
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