The rapid succession of events of the past four years have challenged conventional wisdom on political Islam. After the democratic openings in 2011, mainstream Islamist groups—affiliates and descendants of the Muslim Brotherhood—rose to newfound prominence after decades in opposition, but grappled with the challenges of governance and political polarization. The subsequent “twin shocks” of the coup in Egypt and the emergence of ISIS are forcing a rethinking of some of the basic assumptions of, and about, Islamist movements, including on: gradual versus revolutionary approaches to change; the use of tactical or situational violence; attitudes toward the state; and how ideology and political variables interact.