Fiedler's contingency theory proposes that leadership effectiveness depends on how well a leader's style fits the situation. The theory identifies two leadership styles - task-motivated and relationship-motivated - and suggests that leadership style interacts with situational control to influence work group performance. Situational control depends on leader-member relations, task structure, and position power. The theory emphasizes that leadership style is relatively fixed and the key is matching leaders to appropriate situations. While it highlighted situational leadership, weaknesses include an inability to be sensitive to tasks and relationships simultaneously. The theory suggests nurse leaders can positively impact performance by improving staff relationships, providing training for structured tasks, and involving staff in decision making.