Project cost management is keeping your project within its defined budget. It is also an essential part of project management.
Cost estimating, cost budgeting, and cost control are three cost related processes that interact with each other and with other areas of project management. All of these processes require effort and a working knowledge of the cost of things. Depending on the complexity of the project they can require more than one person, and they may occur more than once during the life of a project.
Project cost management can be very simple, or extremely complex.
Cost estimating: Developing an approximation or estimate of the costs of the resources needed to complete a project.
Cost budgeting: Allocating the overall cost estimate to individual work items to establish a baseline for measuring performance.
Cost control: Controlling changes to the project budget.
