This refers to a theory of social behaviour which states that the behaviour of human beings is influenced significantly by the way other members in society label them. It has been used to explain a variety of social behaviour among groups, including deviant criminal behaviour. According to this theory, individuals who are labelled as criminals by society, for instance, may be more likely to engage in criminal activities simply due to such social labelling. By the same logic, positive labelling by society can influence individuals to exhibit positive behaviour. The labelling theory was developed and popularised by American sociologist Howard S. Becker in his 1963 book Outsiders.