Fiedler's Contingency Theory proposes that a leader's effectiveness depends on how well their leadership style fits the situation. It suggests leaders have one dominant style that can vary based on factors like the leader-member relationship, task structure, and position power. A leader's style may shift depending on pressure from personal traits, the environment, and communications with their team. Using this theory, a leader would assess the context of their role to determine the best style for resolving conflicts, motivating members, and driving results.