The data suggested that managers actually did not spend a lot of time on planning or strategizing. On the contrary, they spent most of their day answering telephone calls, solving problems, dealing with people, responding to crises, and had to deal with interruptions regularly.
He found that managers could not stick to one task since they were constantly being interrupted either by a phone call or a crisis. Over the years, managerial roles have become busier and more stressful.
For better understanding, Mintzberg categorized all activities into ten managerial roles performed over the course of a day. These are as follows:
Interpersonal Roles : Figure head , Leader , Liasion
Informational Roles : Monitor , Desseminator , Spokesperson
Decisional Roles : Entrepreneur , Disturbance Handler , Resource allocator , Negotiator