Briefly describe French and Raven's five forms of interpersonal power that managers use.

Answers will vary. French and Raven identified five forms of interpersonal power that managers use: reward, coercive, legitimate, referent, and expert power.
Reward power is power based on an agent's ability to control rewards that a target wants, such as salary increases, bonuses, and promotions. Coercive power is power that is based on an agent's ability to cause a target to have an unpleasant experience. Legitimate power, which is similar to authority, is power that is based on position and mutual agreement. Referent power is an elusive power that is based on interpersonal attraction. Expert power is the power that exists when an agent has specialized knowledge or skills that a target needs. Please see the section "Forms and Sources of Power in Organizations" for more information.