Chapter 7 of the PMBOK 6th edition outlines project cost management, emphasizing the importance of planning, estimating, budgeting, and controlling costs early in the project lifecycle. It discusses the establishment of a cost management plan which includes policies, procedures, and documentation necessary for managing and expending project costs effectively. Key inputs, tools, techniques, and outputs related to cost management processes are also detailed, alongside the significance of expert judgment and analytical techniques in financial decision-making.