“…Although POS theory is criticized for placing too much emphasis on structural political system arrangements and too little emphasis on situational arrangements-that is to say, specific contested issues (Giugni, 2004), we argue for the relevance of POS in studying activists' political significance for two reasons. Firstly, social movement studies demonstrate the important moderating role of POS in activists' legislative influence (Beyeler & Rucht, 2010;Dalton et al, 2003;McAdam, 1996;Meyer & Minkoff, 2004;Snow et al, 2005;Vráblíková, 2013), and it is common practice to include POS principles in activists' political efficacy studies. For example, Cornwall, King, Legerski, Dahlin, and Schiffman (2007) found that, although the women's suffrage movement had sufficient resources to mobilize, their political impact remained limited due to a lack of political opportunities.…”