This article an excerpt from the book Extreme Success: Building High-Performance Teams" by Daniel Coyle, explores the foundational elements of successful teams. The author, drawing on experiences with groups like the U.S. Navy SEALs and Pixar, identifies three "culture codes": a sense of safety, strong cooperation, and self-organization. These codes are shaped by specific "signals": belonging signals create safety, vulnerability signals enhance cooperation, and purpose signals foster self-organization. The text elaborates on each signal, providing real-world examples, such as the negative impact of a lack of belonging signals in a missile squadron, the importance of sharing vulnerabilities in a restaurant and with Navy SEALs, and how purpose signals guide both executive and creative organizations like those managing soccer hooligans or Pixar and Disney animation studios. Ultimately, the piece emphasizes that the consistent and repetitive transmission of these signals is crucial for building and maintaining a cohesive and high-performing team culture.