Does the multiple award preference at FAR 16.504 apply to sole source awards pursuant to FAR Subpart 19.8? My contracting office has been requested to issue a solicitation sole source to an 8(a) firm for a single award IDIQ services contract. I know that authority for sole source contracts is found at FAR 6.302-5(b )(4) and FAR Subpart 19.8. However, my reading is that for IDIQ contracts, FAR 16.504 still applies. Hence the multiple award preference described FAR 16.504( c) would still apply and as such, in order to pursue a single award IDIQ, the Contracting Officer would have to document the file with a determination that a single award is most appropriate, giving consideration to the content provided at FAR 16.504( c)(1)(ii). The requirements are not for manufacturing, will not exceed $4M total, and are not for advisory and assistance services. My inclination is to push for a competitive procurement, perhaps an 8(a) or other small business set-aside if the market research supports it.