This document summarizes Emile Durkheim's theory of suicide from his 1897 book. Durkheim analyzed suicide rates to understand why some groups had higher rates than others. He identified three types of suicide: egoistic (from weak social integration), altruistic (from over-integration into a group), and anomic (from rapid social change causing imbalance). Durkheim believed social factors, not individual ones, caused suicide rates to vary. His theory used empirical data to link social solidarity, control, and suicide rates, establishing sociology's role in empirical science. However, it was criticized for neglecting psychological factors and relying on limited suicide data.