Final answer:
Fiedler's contingency leadership model identifies three dimensions of situational control: leader-member relations, task structure, and leader's position power, which all influence leadership effectiveness.
Step-by-step explanation:
The dimensions of situational control identified by Fiedler's contingency leadership model are leader-member relations, the degree of task structure, and the leader's position power. Leader-member relations refer to the level of trust, respect, and confidence between the leader and the followers.
Task structure relates to the extent to which the tasks at hand are clearly defined and structured. The final dimension, leader's position power, is concerned with the power inherent in the leader's position itself, such as the ability to hire, fire, reward, and punish.
Fiedler's model suggests that the effectiveness of a leader's style, be it task-oriented or relationship-oriented, is contingent on these situational dimensions. Leadership effectiveness can therefore vary depending on how favorable a situation is, considering these three dimensions.