This book explores the Complementary Management Model. Building on extensive theoretical considerations on management and leadership, it outlines the seven elements of the model: the management actors (1) jointly fulfil management tasks (2) serving two management functions (3) by performing management routines (4) and applying formal management instruments (5), which requires management resources (6) and management unit structures (7). The key mechanisms of Complementary Management include the primacy of employee self-leadership, compensatory interventions of the line manager in the absence of such self-steerage, and active roles for senior managers and HR advisors in the management/leadership process.