1) The Fiedler Contingency Theory states that a leader's effectiveness depends on both their leadership style and the situation, including leader-member relations, task structure, and the leader's power. 2) Leadership style is measured using the Least-Preferred Co-Worker scale, with high scores indicating a relationship-oriented style and low scores a task-oriented style. 3) The theory contends that task-oriented leaders are best for very favorable or very unfavorable situations, while relationship-oriented leaders work best for situations of intermediate favorability.