An ongoing four-year, 360-degree study of senior executives (191 participated, 187 quantitative, 147 qualitative) found four courage behaviours — Step Up, Step In, Step Forward, Step Together — explain roughly 75% of leadership effectiveness, and 93.7% of leaders fall measurably short. Supporting literature: Project Aristotle on psychological safety and team performance, Deloitte on decision speed, BCG on innovation revenue.