This document summarizes the Disc Theory personality assessment developed in the 1920s. It describes four personality types - Dominance, Inducement, Submission, and Compliance - determined by whether a person is outgoing/reserved and people-oriented/task-oriented. Each type is defined by its general characteristics, value to a team, potential weaknesses, greatest fear, and what motivates it. The assessment aims to identify predictable traits and behaviors of people in different environments.