Private information is relevant to Altman’s privacy theory because of his concern with self-disclosure and its effects on relationship development (Altman, Vinsel ,&Brown, 1981). Consequently, Altman has influenced the way researchers think about self-disclosure and the process of regulating privacy. Altman’s early work on privacy was less focused on private information and was more focused on environmental factors than his later work. Although there have been a number of ways Altman’s theory has been used, at least two extensions of Altman’s theory are based on Altman’s linkage of privacy and disclosure: Petronio’s (2002) theory of communication privacy management and Derlega and haikin’s (1977) dual boundary concept