The Project Management Institute (PMI) organizes project management work into two intersecting dimensions. The first dimension is the five Process Groups: Initiating, Planning, Executing, Monitoring & Controlling, and Closing. These groups describe the lifecycle of project management effort, flowing chronologically from authorization through delivery and formal termination. The second dimension is the ten Knowledge Areas: Integration, Scope, Schedule, Cost, Quality, Resource, Communications, Risk, Procurement, and Stakeholder. Each knowledge area groups together the specialized knowledge required to manage a particular aspect of a project, such as time, money, or people.
A process is a set of interrelated actions that produce one or more outputs, while a process group is a logical aggregation of processes that share similar functions. In the PMBOK 6th edition framework, there are 49 processes in total, and every process is mapped to exactly one Process Group and exactly one Knowledge Area. This creates a matrix view in which you can see, for example, that Integration contains seven processes, Risk contains six, and that Executing holds the largest number of processes because most of the project work and coordination happens there. Outputs of one process become inputs to another, and the process groups are not strictly linear; Planning is rarely done once without revision, and iterations across groups are the norm.
Understanding this matrix is the foundation for the exam because it explains where each deliverable lives and why. It also clarifies the relationship between a project, a program, and a portfolio. A project is a temporary endeavor producing a unique product, service, or result. A program is a group of related projects coordinated to obtain benefits not available from managing them individually. A portfolio is a collection of projects and programs aligned to strategic objectives. The triple constraint of scope, time, and cost frames every project decision: change one and at least one other moves, with quality often added as a fourth dimension.