entered
             Leadership depends on the situation or is contingent on other factors
             Leader-Member Relations (Good/Poor)
             Task Structure (Structured/Unstructured)
             Hersey & Blanchard: Focus on follower:
             When highly immature, use Telling style
             When moderately immature, use Selling style
             When moderately mature, use Participating style
             When highly mature, use Delegating style
             ...