From the book Surrounded by Idiots  by Thomas Erikson, introduces a behavioral classification system based on four colors: Red, Yellow, Green, and Blue. The author shares his personal journey, inspired by his father's work on understanding customer profiles using William Moulton Marston's principles (known from DISC methodology), which led to the co-founding of TTI Success Insights in 1984. The core premise of the book is that differences in behavior, which often cause individuals to perceive others as "idiots," can be understood through this color-coded system, emphasizing that communication must occur on the listener's terms. Detailed sections break down the strengths, weaknesses, communication styles, and stress factors for each color (Red for dominance and speed, Yellow for influence and sociability, Green for stability and relationships, and Blue for compliance and analysis), offering practical advice on how to interact with and provide feedback to people of different types.