Irwin Altman’s and Alan Westin’s theories were selected because they have
stood the test of time. Both figure prominently in major reviews of privacy in the
1970s (Margulis 1977), 1980s (Sundstrom 1986, Chap. 13), and 1990s (Newell
1995). Moreover, they have paved the way for others, particularly Petronio’s CPM
theory.