Expectancy Violation Theory

Expectancy violations theory (EVT) is a theory of communication that analyzes how individuals respond to unanticipated violations of social norms and expectations. The theory was proposed by Judee K. Burgoon in the late 1970s and continued through the 1980s and 1990s as "nonverbal expectancy violations theory", based on Burgoon's research studying proxemics. Burgoon's work initially analyzed individuals' allowances and expectations of personal space and how responses to personal space violations were influenced by the level of liking and relationship to the violators. The theory was later changed to its current name when other researchers began to focus on violations of social behavior expectations beyond nonverbal communication. Because EVT is sociopsychological in nature and focuses on social codes in both intrapersonal and interpersonal communication, it is closely related to communication theories such as cognitive dissonance and uncertainty reduction theory.

This theory sees communication as an exchange of behaviors, where one individual's behavior can be used to violate the expectations of another. Participants in communication will perceive the exchange either positively or negatively, depending upon an existing personal relationship or how favorably the violation is perceived. Expectancies are primarily based upon social norms and specific characteristics and idiosyncrasies of the communicators. Expectancies can be derived directly from the current communication interaction but are often determined by a prexisting blend of person requirements (biological/survival needs), expectations (normative schemata) and desires (likes and dislikes) known as the mnemonic 'RED'. This is known as a person's interaction position (IP). Violations of expectancies cause arousal and compel the recipient to initiate a series of cognitive appraisals of the violation. The theory predicts that expectancies influence the outcome of the communication interaction as either positive or negative and predicts that positive violations increase the attraction of the violator and negative violations decrease the attraction of the violator.

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