This document summarizes eight major theories or schools of criminology: pre-classical, classical, neo-classical, typological, geographical, sociological, socialistic, and clinical. It provides details on the key ideas of each school. The pre-classical school emphasized crime was due to evil spirits. The classical school viewed individuals as having free will and proposed punishment should outweigh pleasure from crime. The neo-classical school examined biological, psychological and mental factors. The typological school linked crime to climate and environment. The geographical school studied links between location and criminal behavior. The sociological school analyzed social and cultural influences. The socialistic school tied crime to economic conditions like poverty and unemployment. The clinical school