C010¶


Research	R0028 — Prompt Engineering Claims
Run	2026-03-26
Claim	C010

Claim: RFC 2119 is the Internet Engineering Task Force standard that defines the meaning of requirement-level keywords like MUST, MUST NOT, SHOULD, and MAY, and has been in use since 1997.

BLUF: Confirmed. RFC 2119, authored by S. Bradner of Harvard University, published March 1997, is a Best Current Practice (BCP 14) document that defines keywords MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD, SHOULD NOT, RECOMMENDED, MAY, and OPTIONAL for use in IETF documents.

Probability: Almost certain (95-99%) | Confidence: High

Summary¶

Entity	Description
Claim Definition	Claim text, scope, status
Assessment	Full analytical product with reasoning chain
ACH Matrix	Evidence x hypotheses diagnosticity analysis
Self-Audit	ROBIS-adapted 4-domain process audit

Hypotheses¶

ID	Hypothesis	Status
H1	Claim is accurate as stated	Supported
H2	Partially correct — minor details may differ	Inconclusive
H3	Claim is materially wrong	Eliminated

Searches¶

ID	Target	Results	Selected
S01	Primary search	10	3

Sources¶

Source	Description	Reliability	Relevance
SRC01	RFC 2119 — IETF Datatracker	High	High