After The Second World War, some countries do the economic development and reconstruction peacefully. Then, the management experts start to reflect on the leader and leadership concept. Some of the experts are the war veterans and the Army commanders in developed states.

Each sector in this world has different aims. In economic sector, the aim is the highest profit. The aim of military sector is the protection of authority. The government sector's aim is to build an authority and the people's supports. In social sector, the welfare of people becomes the aim. Each sector expects a qualified leader whom has an art to reach the aims.

In its essence meaning, the organization's variations and its aim has a strong relation with the leadership's definition. I quote an important definition from Paul Hersey and Ken Balanchard's opinion in Management of Organizational Behavior: Utilizing Human Resources book:

* Leadership is the activity of influencing people to strive willingly for group objective

* Leadership is interpersonal influence exercised in a situation and directed through the communication process toward the attainment of a specialized goal or goals

* Leadership is the process of influencing the activities of an individual or group in effort toward goal achievement in a given situation. From this definition of leadership, it follow that the leadership process is a function of the leader, the follower, and other situational variables L=f (l, f, s) (Prentice Hall; 1988).

From those definitions, we can see that a leader is an influencing person for the other persons to achieve the group's aim. To gain the aim, a leader in a group should go through communication, indoctrination, training, makes a job schedule, job evaluation, and reward and punishment. Those are the formal processes in leading an organization. Anybody can be a leader; it does not concern his predicate. He can be a leader when realized or not, he is able to influence the other persons. He should not be a general, manager, or a big boss.