A large source selection has a layered evaluation structure. Three groups are established and play distinct roles:
Source Selection Evaluation Board (SSEB): The working-level team that actually reads and scores the proposals. They are organized into technical, past performance, and cost/price teams. For a major fighter program this board could have dozens of people from engineering, logistics, financial management, and contracting.
Source Selection Advisory Council (SSAC): A senior review body above the SSEB. They review the SSEB's findings and make a recommendation to the final decision-maker. They provide an independent check on the evaluation.
Source Selection Authority (SSA): The single person who makes the final award decision. For a program of this magnitude this is typically a general officer or a very senior civilian - someone with the authority and seniority to make a multi-billion dollar decision and defend it in court. The SSA does not evaluate proposals directly - they rely on the SSEB and SSAC - but the decision is theirs alone.
Important: Every member of the source selection team must be formally appointed in writing, complete ethics training, and sign a non-disclosure agreement. There are strict rules about what information can be shared and with whom. Violations can invalidate the entire competition.