C009 — ACH Matrix¶


Research	R0002 — Research Standards for AI-Assisted Writing
Run	2026-03-13
Claim	C009

Matrix¶

	H1: All sub-claims accurate	H2: Counts correct, attribution wrong	H3: Numerical counts incorrect
SRC01-E01: Published by IOM under NAS	++	+	N/A
SRC01-E02: Four stages (8+6+4+3=21)	++	-	--
SRC02-E01: "21 standards with 82 elements"	++	N/A	--
SRC02-E02: Table of contents structure	+	N/A	-
SRC03-E01: NAP catalog confirms report	+	+	N/A

Legend: - ++ Strongly supports - + Supports - -- Strongly contradicts - - Contradicts - N/A Not applicable to this hypothesis

Diagnosticity Analysis¶

Most Diagnostic Evidence¶

Evidence ID	Why Diagnostic
SRC02-E01	Strongly supports H1 and strongly contradicts H3 -- the explicit "21 standards with 82 elements" quote is the key differentiator, confirming both numerical claims simultaneously
SRC01-E02	Strongly supports H1 and strongly contradicts H3 -- the arithmetic verification (8+6+4+3=21) provides independent confirmation of the standard count

Least Diagnostic Evidence¶

Evidence ID	Why Non-Diagnostic
SRC03-E01	Supports H1 and H2 equally -- confirms publication existence without addressing numerical claims

Outcome¶

Hypothesis supported: H1 -- All numerical sub-claims are confirmed. 21 standards, 82 elements, four stages. Published by IOM under the National Academies umbrella.

Hypotheses eliminated: H3 -- No evidence supports any different numerical count. Eliminated with high confidence.

Hypotheses inconclusive: H2 -- The attribution to "NAS" is technically imprecise (IOM is more precise), but the IOM operates under the National Academies. This is a minor nuance, not a substantive error.