We recommend that the Cost Estimation and Analysis Division design and implement policies and procedures requiring a formalized review, approval, and documentation of key assumption updates and risk assessments. This documentation should be at a sufficient level of detail to demonstrate management determinations and rationale for their decisions, and the process for selecting specific assumption values, specifically in cases where management’s determination differ from the assumption values supported by the available evidence. The documentation should also address any limitations of the available evidence and how these impact management’s determination of selected assumption values.