Deviation from Social Norms: Norms are expected ways of behaving in a society according to the majority and those members of a society who do not think and behave like everyone else break these norms and so often defined as abnormal. the definition is based on the facts that:
1) abnormal behaviour is seen as vivid and unpredictable, causes observer discomfort and violates moral or ideal standards (Rosenhan and Seligman 1989) as it differs from most people's behaviour and standards.
2) abnormal thinking is delusional, irrational or incomprehensible because it differs from commonly accepted or usual beliefs.
Limitations culturally relative, what is seen and accepted in one culture may not be normal in another. DSN is susceptable to abuse, what may be acceptable now may not be in the future, since norms change over time.Also, deviation in context and degree, for example, wearing a swimming costume on the beach is acceptable, but seen as abnormal in a meeting. Shouting in a public place is abnormal unless in an argument.