This document discusses various leadership theories including: trait theory, which proposes that leadership traits are innate; behavioral theory, which focuses on observable leadership behaviors; Fiedler's contingency model, which emphasizes that leadership effectiveness depends on the leader's style and the situation; Hersey-Blanchard's situational theory, which identifies four leadership styles based on task and relationship behavior; the managerial grid theory, which plots styles based on concern for production vs people; and Likert's management systems theory, which identifies styles ranging from exploitative to participative.