Final answer:
Mintzberg developed his ten managerial roles by observing the behavior and activities of executives. He conducted a study where he shadowed and interviewed managers from different organizations to understand their roles and responsibilities.
Step-by-step explanation:
Mintzberg developed his ten managerial roles by observing the behavior and activities of executives. He conducted a study where he shadowed and interviewed managers from different organizations to understand their roles and responsibilities. Through this research, Mintzberg identified ten distinct roles that managers play, such as figurehead, leader, and negotiator. These roles help to identify the different functions and responsibilities that managers have in an organization.