B--Provide Independent Scientific, Technical, Engineering and Advisory Services to 89233126QNA000449

Provide independent scientific, technical, engineering and advisory services to all National Nuclear Security Administration (NNSA) and Department of Energy Headquarters (DOE HQ) program and field offices under an enterprise-wide Indefinite-Delivery, Indefinite-Quantity contract with the National Academy of Sciences (NAS). The arrangement is cost-reimbursement with no fee to the government, spanning needs across NAS-supported programs and locations as they arise.

Between notices, the key change is term length: the presolicitation targeted a ten-year contract, whereas the special notice indicates a five-year term. The overall scope and delivery vehicle (enterprise-wide IDIQ via NAS for NNSA/DOE) remain the same, with the only other difference being the notice type.