Durkheim was interested in understanding why suicide rates differed between social groups. He believed that only social factors, not individual reasons, could explain differences in suicide rates across cultures and over time. Durkheim identified four types of suicide based on two social dimensions: integration (attachment to society) and regulation (external constraints on people). Egoistic suicide results from low integration; altruistic from high integration. Anomic suicide stems from low regulation during times of normlessness. Fatalistic suicide occurs under high regulation with excessive social control over individuals.