In a 1991 article, John McCarthy, David Britt, and Mark Wolfson begin with an assertion that is often acknowledged in the social movement field but seldom receives the attention it deserves. They write:

Their observation reflects the findings of a loose archipelago of writings that has developed since the early 1970s around the theme of “political opportunity structure.” In his introduction to this part, Doug McAdam points out that, rather than focus on some supposedly universal cause of collective action, writers in this tradition examine political structures as incentives to the formation of social movements. But there are two major ways of specifying political structures in relation to collective action: as cross-sectional and static structures of opportunity and as intrasystemic and dynamic ones. This essay briefly discusses both but explores in much greater depth why – in my view – “dynamic” opportunities appear to impinge more directly on the decision-making of social movements and permit them to create their own opportunities.

A TYPOLOGY OF OPPORTUNITY STRUCTURES

As in any developing paradigm, there is a healthy and many-sided debate about how to conceptualize political opportunity structure. Some researchers have focused on large-scale structures, others on ones that are proximate to particular actors; some analyze cross-sectional variations in political opportunity, while others look at how changes in political conflict and alliances trigger, channel, and demobilize social movements.