1. Abraham Maslow's - Hierarchy Theory : in this theory Abraham Maslow shows us the five  categories of basic need. They are phycological needs, safety needs,love and belonging,esteem,self-actualisation.

2. Henry Mintzberg - managerial roles: he said in his theory that skill are learned through experience. 

3. Winslow Tylor's - scientific Management: in his theory he said that workers and manager should co-operate each other and focus on productivity.

4. Henry fayol's - principal of management:  he divide management into 14 principles for manage.

5.Mc Gregor's -Theory of X and Theory Y: in this theory he refers  two styles of management – authoritarian (Theory X) and participative (Theory Y). Managers who use this approach trust their people to take ownership of their work and do it effectively by themselves.