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Search all opportunities →Source selection is the process by which the government evaluates proposals and decides which contractor to award. Governed by FAR Part 15, this process is designed to be fair, transparent, and based solely on the criteria published in the solicitation. Understanding how evaluators think — and how the process works — is essential for writing proposals that win.
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When the government conducts a negotiated procurement under FAR Part 15, it assembles a source selection team to evaluate proposals. The Contracting Officer typically serves as the Source Selection Authority (SSA) for procurements under a certain dollar threshold, while a senior official serves as SSA for larger acquisitions. The evaluation itself is conducted by the Source Selection Evaluation Board (SSEB), a team of technical and functional experts who independently assess each proposal.
The government can only evaluate against the factors and subfactors stated in Section M of the solicitation. They cannot introduce new criteria, change the relative weights after proposals are received, or consider information not contained in the proposal. This is why compliance with Section L (Instructions to Offerors) is non-negotiable — if the evaluator cannot find your response to a specific factor, you effectively did not address it.
Source selection typically takes 30 to 180 days depending on the procurement's complexity, number of proposals received, and whether discussions are held. During this period, contractors have no visibility into the process and should not contact the government about the procurement (doing so can result in disqualification).
Every negotiated procurement must include evaluation factors. FAR 15.304 requires that price or cost be included as an evaluation factor in every source selection. Beyond price, the government selects factors that best discriminate between offerors for the specific requirement. The three most common non-price factors are technical approach, past performance, and management.
The technical factor evaluates your understanding of the requirement and your proposed solution. Evaluators look for demonstrated understanding of the government's problem, a credible and feasible approach, innovation that reduces risk or improves outcomes, and realistic resource allocation. This is typically the most heavily weighted non-price factor.
Common subfactors include: understanding of requirements, technical methodology, staffing plan, transition approach, quality control, and risk management.
Past performance evaluates the offeror's track record on contracts of similar scope, size, and complexity. The government reviews CPARS reports, contacts references, and assesses relevance. A contractor with no past performance receives a "neutral" rating — not positive, not negative. This is significantly better than "marginal" or "unsatisfactory" ratings.
Evaluators assess: relevance of past contracts, quality of performance, schedule adherence, customer satisfaction, and ability to manage contracts of similar complexity.
Price is always evaluated but not always scored in the same way as technical factors. In best value tradeoffs, the government conducts a price realism analysis (for cost-type contracts) or price reasonableness analysis (for fixed-price contracts) to determine whether the proposed price reflects a sound understanding of the work and is neither unrealistically low nor unreasonably high.
Price evaluation considers: total evaluated price across all CLINs and option periods, price realism (cost contracts), unbalanced pricing, and compliance with certified cost or pricing data requirements (if applicable).
The evaluation methodology determines how the government balances price against non-price factors. This distinction fundamentally affects your proposal strategy, pricing approach, and investment level.
The government can pay more for a higher-rated technical proposal if the additional quality justifies the additional cost. The SSA documents the tradeoff rationale in the source selection decision document.
Proposals are evaluated for technical acceptability on a pass/fail basis. Among all technically acceptable proposals, the lowest price wins. There is no benefit to exceeding the minimum technical requirements.
Strategy Note
The evaluation methodology must be stated in Section M. Read it carefully — some solicitations use a hybrid approach (e.g., technical/past performance evaluated on a best value basis, then price becomes the tiebreaker among "Outstanding" proposals). Your entire proposal strategy depends on correctly interpreting the evaluation scheme.
The Source Selection Evaluation Board typically consists of specialists aligned to each evaluation factor. A large procurement might have separate technical, past performance, cost/price, and small business evaluation teams, each led by a chairperson. Understanding who reads your proposal informs how you write it.
Write for the Evaluator
Use the exact language from the evaluation criteria in your section headers and topic sentences. If Section M says the government will evaluate "understanding of requirements," your proposal should have a section titled "Understanding of Requirements" that begins with a clear thesis statement. Make it impossible for the evaluator to miss your responsiveness.
Some procurements replace or supplement written proposals with oral presentations. This approach is becoming more common, particularly for services contracts, as it reduces proposal preparation time and allows the government to assess the offeror's key personnel and communication capabilities directly. FAR 15.102 governs oral presentations.
Oral presentations are typically recorded or transcribed by the government and become part of the official evaluation record. Everything said during the presentation can be used in the evaluation — so ensure your team is consistent, accurate, and does not make promises that cannot be kept.
A debriefing is your right under FAR 15.506 to learn how your proposal was evaluated. For negotiated procurements (FAR Part 15), you must request a debriefing within 3 calendar days of receiving the award notification. The government must provide the debriefing within 5 calendar days of the request. Debriefings are the single most valuable source of intelligence for improving future proposals.
Maximizing Debriefing Value
Prepare 10-15 specific questions before the debriefing. Ask about your adjectival ratings on each factor, what the evaluators found most compelling in the winning proposal (without asking for proprietary details), whether your pricing was considered high or low relative to the competitive range, and what you could have done differently to improve your rating on each factor. Take detailed notes — this intelligence directly informs your next pursuit.
Bureauify analyzes award data across thousands of procurements to help you understand evaluation patterns, pricing trends, and what it takes to win at specific agencies. Make data-driven bid decisions.