There is no single optimal leadership style, and successful leaders adjust their styles based on "follower readiness," according to the Hershey and Blanchard situational leadership model. Follower readiness is an employee’s readiness to perform in a given situation as determined by two factors: follower ability and follower confidence.[i] This model proposes that leaders deal with varying levels of follower readiness by adjusting their relative emphasis on task and relationship behaviors. That is, leaders should be able to place varying levels of emphasis on task and relationship with the people they are leading, depending on what is needed and situationally appropriate. According to the model, this gives rise to four leadership styles