Classical Theory, which developed in the mid 18th century, was based on utilitarian philosophy. Cesare Beccaria, author of On Crimes and Punishments (1763–64), Jeremy Bentham, inventor of the panopticon, and other classical school philosophers argued that people have free will to choose how to act; that deterrence is based upon the notion of the human being as a 'hedonist' who seeks pleasure and avoids pain, and a 'rational calculator' weighing up the costs and benefits of the consequences of each action; that punishment (of sufficient severity) can deter people from crime, as the costs (penalties) outweigh benefits, and that severity of punishment should be proportionate to the crime.
Classical theory ignores the possibility of irrationality and unconscious drives as motivational factors.
Positivist Theory - presumes that criminal behavior is caused by internal and external factors outside of the individual's control. Positivism can be broken up into three segments which include biological, psychological and social positivism. Lombroso, an Italian prison doctor sometimes regarded as the "father" of criminology, was one of the largest contributors to biological positivism. Lombroso’s work suggested that physiological traits such as the measurements of one's cheek bones or hairline, or a cleft palate, considered to be throwbacks to Neanderthal man, were indicative of "atavistic" criminal tendencies. Enrico Ferri, a student of Lombroso, believed that social as well as biological factors played a role, and held the view that criminals should not be held responsible when factors causing their criminality were beyond their