The first step in understanding deviant behavior is the study of cultural and social norms. Norms vary widely across cultures, and in some cases, behavior which is polite or expected in one culture may be considered rude or inappropriate in another. The study of norms includes the history of such norms, the evolutions of norms over time, and the study of changes which occur in norms as society itself shifts. For example, wearing gloves in public was once a social norm for ladies in much of the Western world, but would now be considered slightly eccentric unless the weather was cold.
Deviance can be viewed from psychological, biological, and sociological perspectives. From the perspective of sociology, issues such as class can play a role in deviant behavior. Theft, a common instance of deviant behavior, could be said to be driven by sociological pressures such as poverty. Biologists may be interested in variations in the brain which lead to expressions of deviance, along with the biological motivations for normal behavior. Psychologists are interested in the thought processes behind normal and deviant behavior, ranging from depression, which may cause people to act out, to the study of early childhood development, which explains how people learn about behavioral boundaries. Deviance is relative to time and place because what is considered deviant in one social context may be non-deviant