Interlocks not only occur between corporations, but also between corporations and non-profit institutions such as foundations, think tanks, policy-planning groups, and universities.Bowman, 1996: p. 22 They can also be seen as a subset of connections in a larger upper class social network which includes all of the aforementioned types of institutions as well as elite social clubs, schools, resorts, and gatherings.Domhoff, 2006: Chapter 3 Multiple directors are "roughly twice as likely as single directors to be in the Social Register, to have attended a prestigious private school, or to belong to an elite social club."
