The document provides an overview of leader-member exchange (LMX) theory. It defines LMX theory as focusing on the interactive relationship between a leader and subordinates. The theory proposes that leaders form distinct relationships, either in-groups or out-groups, with subordinates. In-groups receive more privileges and resources while out-groups receive the minimum. The document outlines the phases of LMX relationships, benefits of high-quality LMX, strengths and weaknesses of the theory, and provides examples of how LMX can be applied and measured in organizations.