Work in the project performance domains is guided by the principles of project management. As described in The Standard for Project Management [1], a principle is a fundamental norm, truth, or value. The principles for project management provide guidance for the behavior of people involved in projects as they influence and shape the performance domains to produce the intended outcomes. While there is conceptual overlap between the principles and the performance domains, the principles guide behavior, while the performance domains present broad areas of focus in which to demonstrate that behavior. Figure 1-1 shows how the project management principles sit above the performance domains, providing guidance to activities in each performance domain.