X and Y theory was introduced by Mc gregor. Theory X and Theory Y were first explained by McGregor in his book, "The Human Side of Enterprise," and they refer to two styles of management – authoritarian (Theory X) and participative (Theory Y).
Leadership theory which explains that a leader is strongly affected by the situation in which he works is
Leadership theory which explains that a leader is strongly affected by the situation in which he works is Situational theory. The situational leadership theory refers to those leaders who adopt different leadership styles according to the situation and the development level of their team members. It is an effective way of leadership because it adapts to the team's needs and sets a beneficial balance for the whole organization.
Followers decide whether a person is a leader or not is according to Followers theory. According to this leader-follower theory followers may from groups and the followers' groups naturally have their own characteristics and needs. According to the characteristics and nature of followers' groups needs are ascertained.
Management is both art and science. It is considered as a science because it has an organized body of knowledge which contains certain universal truth. It is called an art because managing requires certain skills which are personal possessions of managers.