This YouTube video introduces the theory and application of the Situational Leadership style of leadership:

How to pick the right leadership and management style

To be a good leader, you need to know how to vary your leadership style depending upon the circumstances. For example, Leading in a crisis requires a different approach to managing everyday circumstances. Therefore, as a leader, you need to adapt your style accordingly. This is called situational leadership. Paul Hersey and Ken Blanchard developed the most well-known model for situational leadership. This model helps to show the most appropriate form of leadership, depending upon the nature of the task and the competency and commitment of the team. In simple terms, it breaks down into four key leadership styles: directive, delegating, supporting, and coaching.

For more information, follow the link to the full article: Situational Leadership.