The product is built based on our new set of requirements, and measures would be used to direct corrective action as needed. Closing ensures that the customer's request to change requirements was documented to conclusion. The four primary knowledge areas are scope, time, cost, and quality. The four facilitating areas are human resources, risk, procurement, and communication. The remaining overarching area is integration.
Integration is concerned with properly coordinating the other knowledge areas.
Each knowledge area consists of a series of processes. Each process includes inputs, tools and techniques, and outputs. Inputs are the items needed to complete the process. The tools and techniques define what to do to the inputs. Lessons learned Figure 2.