RFI, RFP, RFQ & tender documents · Core
Functional specification
Also called: performance specification
ELI5
Requirements expressed in terms of outcomes or functions rather than design details.
Used in conversation
“The team needs one controlled copy of functional specification, with an owner and date.”
Pitch context
You will see “Functional specification” in operating plans, procurement packs, supplier reviews and supply-chain reports when the discussion reaches rfi, rfp, rfq & tender documents.
Why it matters: In rfi, rfp, rfq & tender documents, a loose definition can change rights, obligations, approval, disclosure or enforceability.
Caution
Meaning, enforceability and required process vary by jurisdiction and agreement; this definition is not legal advice.
Sources & evidence · 3
Direct term-level sources and supporting source families.
- U.S. Acquisition.gov — Federal Acquisition Regulation Part 15 — Contracting by NegotiationDirect source · primary · checked 2026-08-16
- UK Government — Groceries Supply Code of PracticeDirect source · primary · checked 2026-08-16
- U.S. Bureau of Labor Statistics — Productivity programmeSupporting source family · primary · checked 2026-08-16