FAR 15.308—Source selection decision.
Plain-English Summary
FAR 15.308 explains how the source selection authority (SSA) must make and document the award decision in negotiated procurements. It covers four core topics: the requirement to compare proposals against all solicitation source selection criteria, the SSA’s ability to rely on reports and analyses prepared by others, the requirement that the final decision reflect the SSA’s independent judgment, and the need to document the decision and the business judgments and tradeoffs behind it. It also addresses how to explain the benefits of paying more for a higher-rated proposal, while making clear that the documentation does not have to mathematically quantify every tradeoff. In practice, this section is about ensuring the award decision is rational, defensible, and tied to the solicitation—not just a summary of evaluator opinions. It helps protect the integrity of the source selection process, supports transparency and accountability, and creates a record that can withstand protest scrutiny.
Key Rules
Compare Against All Criteria
The SSA must base the decision on a comparative assessment of proposals against every source selection criterion stated in the solicitation. The decision cannot ignore or substitute unstated factors, and it must reflect the full evaluation framework announced to offerors.
Independent SSA Judgment
The SSA may use evaluation reports, consensus findings, and other analyses prepared by source selection team members or advisors, but the final award decision must be the SSA’s own independent judgment. The SSA cannot simply rubber-stamp another person’s recommendation.
Document the Decision
The source selection decision must be documented. The record should show how the SSA reached the decision and why the selected proposal was chosen over alternatives.
Explain Tradeoffs and Business Judgments
The documentation must include the rationale for any business judgments and tradeoffs the SSA made or relied on, including why additional cost was worth the expected benefit. This is especially important in best-value tradeoff decisions.
No Need to Quantify Tradeoffs
Although the rationale must be documented, the SSA does not have to assign numerical values or precisely quantify the tradeoffs that supported the decision. A clear qualitative explanation is sufficient if it shows a reasonable basis for the choice.
Responsibilities
Source Selection Authority (SSA)
Make the award decision based on a comparative assessment of proposals against all solicitation criteria; exercise independent judgment; review supporting reports and analyses as needed; document the rationale for the decision, including tradeoffs and business judgments; explain why any higher-priced proposal offers benefits worth the added cost.
Evaluation Team / Advisors
Prepare evaluation reports, analyses, and recommendations that the SSA may consider. Their role is advisory; they do not make the final source selection decision unless separately designated as the SSA.
Contracting Officer
Support the source selection process, maintain the record, and ensure the decision is properly documented and consistent with the solicitation and applicable acquisition procedures.
Agency
Establish a source selection process that produces a clear record, supports the SSA’s independent decision-making, and preserves documentation sufficient for review and protest defense.
Practical Implications
The decision record should tell a coherent story: what the solicitation valued, how each proposal compared, and why the selected offer was worth choosing over lower-priced or differently rated alternatives.
A common pitfall is overreliance on evaluator language without showing the SSA’s own reasoning; that can make the decision look like a rubber stamp and weaken protest defense.
Another frequent mistake is failing to explain why paying more is justified, especially in best-value tradeoffs where the selected proposal is not the lowest-priced option.
The documentation should be detailed enough to show the basis for the decision, but it does not need spreadsheets or formulas that pretend to precisely measure qualitative differences.
Contracting officers and SSAs should ensure the record aligns with the solicitation criteria; if the rationale relies on unstated considerations, the decision is vulnerable to challenge.
Official Regulatory Text
The source selection authority’s (SSA) decision shall be based on a comparative assessment of proposals against all source selection criteria in the solicitation. While the SSA may use reports and analyses prepared by others, the source selection decision shall represent the SSA’s independent judgment. The source selection decision shall be documented, and the documentation shall include the rationale for any business judgments and tradeoffs made or relied on by the SSA, including benefits associated with additional costs. Although the rationale for the selection decision must be documented, that documentation need not quantify the tradeoffs that led to the decision.