“…In his study of the nuclear disarmament movement, Benford identifies four vocabularies of motive that individual activists employ to make sense of their activism: 'severity' amplifies the direness of the issue at hand; 'urgency' keys the necessity of taking swift action; 'efficacy' emphasizes the ability for individuals to make a difference through their activism; and 'propriety' In our analysis, we argue that Benford's (1993) conceptualization of vocabularies of motive urges us to rethink the operationalization of Barkan's (2004) variables. While it is indeed possible that perceptions of issue severity or personal efficacy range across a continuum, Klandermans's (1984) and Snow and Benford's (1988) (Barkan, Cohn, & Whitaker, 1995;Cable, Walsh, & Warland, 1988;McAdam, 1988;McAdam & Paulsen, 1993). Broadly, differential participation research examines three theoretical constructs: social networks; political engagement; and biographical availability.…”