If you're awarding an Other Than FFP subcontract, make sure you flow down 52.215-2 (Audit and Records - Negotiations) and 52.216-7 (Allowable Cost and Payment). This isn't usually a problem when you're issuing subcontracts with prime contract flowdowns, but it can be an issue if you're issuing flexibly priced purchase orders. In my experience this most often occurs when awarding work to the Scourge of Approved Purchasing Systems everywhere - the dreaded Staffing Companies.