The document summarizes Henry Mintzberg's research on managerial roles. Mintzberg observed that managers are constantly interrupted and cannot focus on single tasks. He categorized 10 managerial roles managers perform in a day: figurehead, leader, liaison, monitor, disseminator, spokesperson, entrepreneur, disturbance handler, resource allocator, and negotiator. These roles involve interactions with others, monitoring the environment, sharing information, making decisions, and handling challenges.