DISC is a system of behavioral assessment based upon observable human behavior. It is unique in the behavioral and personality assessment universe because it recognizes that human beings function in different ways in different environments. Though it has philosophical roots that go back nearly 3,000 years, it is a well-researched framework whose insights have been tested for accuracy across cultures, ethnicities, national spaces, gender expressions, and sexual orientations. In other words, DISC assesses human psychology and behavior at a level more fundamental than these things. In this sense, DISC is a universal language for understanding human behavior. As a framework for understanding one’s self, one’s leadership, and the needs of the team around a leader, it is a profoundly effective tool.