Decision making is a structured technique used while developing the cost management plan, so it belongs to Plan Cost Management. The To-Complete Performance Index (TCPI) is an earned value management tool for forecasting cost efficiency, used under Control Costs. Meetings are necessary to align stakeholders, review funding limits, and finalize project budgets, thus applied in Determine Budget. Historical information review supports analogous estimating and other estimating methods, making it a key technique in Estimate Costs.

Project Management Institute (PMI). A Guide to the Project Management Body of Knowledge (PMBOK® Guide), 6th Edition.

Section 7.1.2.2 “Data Analysis – Decision Making” (p. 240) → Plan Cost Management.

Section 7.4.2.2 “Data Analysis – To-Complete Performance Index (TCPI)” (p. 263) → Control Costs.

Section 7.3.2.5 “Meetings” (p. 254) → Determine Budget.

Section 7.2.2.2 “Historical Information Review” (p. 246) → Estimate Costs.

Kerzner, H. Project Management: A Systems Approach to Planning, Scheduling, and Controlling, 12th Edition, Wiley.

Chapter 15, Cost Management Tools, confirms the mapping of TCPI to cost control (pp. 642–644).

Massachusetts Institute of Technology (MIT) OpenCourseWare – Project Management (Course 1.040/1.401).

Lecture on Cost Estimation and Budgeting: emphasizes historical data for estimates and decision-making frameworks in cost planning.

Stanford University – Civil and Environmental Engineering 268: Project Management.

Module “Cost Estimation and Control” → explains the linkage of meetings to budget approval and TCPI to control processes.