In this extension of the social identity model of collective action (SIMCA; Van Zomeren, Postmes, & Spears, 2008), group expectancies are an intervening construct for the impact of group identification, perceived group inefficacy, and perceived group injustice on normative collective action. In addition to the SIMCA path from greater group identification to more action, Hypothesis 1 was that greater identification fosters less negative group expectancies, which, in turn, promote action. Hypothesis 2 was that the SIMCA path from greater perceived group inefficacy to less action is mediated by negative group expectancies. These hypotheses were for low- and high-status groups, as was the expectation for the SIMCA path from greater perceived group injustice to more action. For the low-status group, Hypothesis 3 was that perceived injustice also undermines action by fostering more negative group expectancies. During severe ethno-religious group conflict in Lebanon, university students reported on SIMCA factors and their group expectancies. Results were in line with SIMCA and Hypotheses 2 and 3, and partly with Hypothesis 1. Group expectancies are discussed in relation to likelihood of amelioration, perceived instability, and emotions. Types of expectancies are discussed, as is the relation of expectancies to normative and non-normative collective action.