Stogdill (1974) concluded that a great many definitions of leadership, and which have some similar elements.

According Sarros and Butchatsky (1996), this term can be defined as a behavior with a specific purpose to influence the activities of the group members to achieve common goals that are designed to give the benefit of individuals and organizations.

Meanwhile, according to Anderson (1988), “leadership means using power to influence the thoughts and actions of the Others in such a way That achieve high performance.”

Based on the above definitions, the leadership has several implications, among others:

* Leadership is about involving people or other parties, namely their employees or subordinates (followers). Their employees or subordinates must have the willingness to accept direction from leaders. However, without the employee or subordinate, there would be no leadership.
* An effective leader is someone who by his power (his or herpower) are able to inspire followers to achieve satisfactory performance. Leaders can use the forms of authority or power to influence the behavior of subordinates differently in different situations.
* Leadership must have the honesty to ourselves (integrity), responsible attitude is sincere (compassion), knowledge (cognizance), the courage to act in accordance with the belief (commitment), belief in yourself and others (confidence) and the ability to convince others (communication) in building the organization.

Leadership is often confused with management. In fact, both are different. According to Bennis and Nanus (1995), focused leaders do the right thing, make sure that we climbed a ladder leaning against the wall properly. While managers focus on doing exactly that while we strive to climb the management ladder as efficiently as possible.

Following the development of management experts thinking about models of leadership:

* The Nature of Leadership Models

In general, studies in the early stages tried researching on the individual character inherent in self-leaders, such as: intelligence, honesty, maturity, decisiveness, ability to speak, sociability in the mix, their socioeconomic status and others (Bass 1960, 1974 Stogdill ). Stogdill (1974) states that there are six categories of personal factors that distinguish between leaders and followers, namely capacity, achievement, responsibility, participation, status and situation.

* Situational Model

This model is a development of earlier models with the main focus of the situation as a determinant factor in leadership skills.

* Effective Leadership Model

This model provides information about the types of behavior (types of Behaviours) effective leaders.

* Contingency Leadership Model

This model focuses on the match between the characteristics of the leader’s personal character, his behavior and situational variables.

* Transformational Model

This is a relatively new model, emphasizing that the essence of a leader needs to motivate his subordinates to perform their responsibilities more than they expect. Transformational leader must be able to define, communicate and articulate the vision of the organization, and subordinates should accept and acknowledge the credibility of leaders.