Once the make-or-buy analysis is completed, which document defines the project delivery method?

The procurement statement of work defines the specific work a seller must perform, but it does not govern the overall delivery method or procurement approach.

After completing a make-or-buy analysis, the procurement strategy captures decisions about how the project will be delivered - whether through fixed-price contracts, cost-reimbursable agreements, or other methods - and outlines the phases and sequencing of procurement activities. It serves as the governing document that translates the make-or-buy outcome into actionable procurement direction. This is distinct from the SOW, which defines the work scope for a specific vendor.

Terms of reference outline the scope and objectives for a consultancy or study, not the project-wide delivery strategy.

A change request documents a proposed modification to the project baseline and is not used to define procurement or delivery strategy.