There is no human society that does not value certain acts and prohibit others. Each society designs rules to measure and judge behaviour that it considers "normal", and to which the members of a group must submit on pain of being excluded from the community. An individual who does not conform to the rest of the group is labelled a "deviant" in relation to the norm in force in that group. But what defines the deviant nature of an act? The aim of this course will be to use selected texts to understand the social construction of deviance and, consequently, to deduce what is defined as 'normality' according to society and time.