The Leadership Practices Inventory Observer Observer - LPI - Portuguese - J-B Leadership Challenge: Kouzes/Posner Author:James M. Kouzes, Barry Z. Posner Leadership is learnable . . . and teachable! Get a clear picture of how you function as a team leader by combining anonymous perceptions of constituents and colleagues, with your own manager self-assessment. The LPI: Observer provides a balanced picture of leadership traits and allows for constructive discussion of ways to improve.