A "servant leader " is someone, regardless of level, who leads simply by meeting the needs of the team.

It shows you the best style to use, based on how capable people are of working autonomously, and how creative or "programmable" the task is.

Often the most effective style to use. 

Charismatic leaders inspire and motivate their team members. But they often focus on themselves and their own ambitions, and they may not want to change anything.

Means following rules rigorously, and ensure that their people follow procedures precisely.

• With a people-oriented style, you focus on organizing, supporting, and developing your team members. This participatory style encourages good teamwork and creative collaboration.
• With task-oriented leadership, you focus on getting the job done. You...

With this, you can identify the best leadership approach to use, based on your people's needs, the task that they're doing, and the environment that they're working in.

This style starts with the idea that team members agree to obey their leader when they accept a job.

You must adapt your approach to fit the situation.