C004 — IPCC Two-Axis Confidence Model¶
Research: R0052 Run: 2026-03-31 Mode: claim
BLUF¶
The claim is almost certainly correct. The IPCC uses a two-axis confidence model with evidence quality (Limited/Medium/Robust) and source agreement (Low/Medium/High). This is directly confirmed by the IPCC's own guidance note for AR5 lead authors.
Probability / Answer¶
Rating: Almost certain (95-99%) Confidence: High Rationale: The IPCC guidance note — the primary source document — explicitly defines these two axes with the exact terminology stated in the claim.
Reasoning Chain¶
- The IPCC AR5 Guidance Note on Consistent Treatment of Uncertainties defines evidence quality using three terms: Limited, Medium, and Robust. [Source: SRC01, High, High]
- The same guidance note defines agreement using three terms: Low, Medium, and High. [Source: SRC01, High, High]
- These two dimensions combine in a matrix to produce five confidence levels: very low, low, medium, high, and very high. [Source: SRC01, High, High]
- Academic analyses of the IPCC framework confirm the two-axis structure. [Source: SRC02, High, High]
- JUDGMENT: The claim accurately describes the IPCC confidence framework with the correct terminology for both axes.
Hypotheses¶
H1: The claim is substantially correct¶
Status: Supported Evidence for: IPCC primary documentation confirms both axes with exact terminology. Evidence against: None.
H2: The claim is substantially incorrect¶
Status: Eliminated Evidence for: None. Evidence against: Primary source directly confirms.
H3: The claim is partially correct — axes exist but with different terminology¶
Status: Eliminated Evidence for: None. The terminology matches exactly. Evidence against: The IPCC guidance note uses exactly "Limited/Medium/Robust" for evidence and "Low/Medium/High" for agreement.
Evidence Summary¶
| Source | Description | Reliability | Relevance | Key Finding |
|---|---|---|---|---|
| SRC01 | IPCC AR5 Uncertainty Guidance Note | High | High | Defines both axes with exact terminology |
| SRC02 | Springer — Confidence levels survey | High | High | Academic confirmation of two-axis framework |
Collection Synthesis¶
| Dimension | Assessment |
|---|---|
| Evidence quality | Robust — primary IPCC documentation |
| Source agreement | High — unanimous |
| Source independence | Independent — IPCC official + academic analysis |
| Outliers | None |
Gaps¶
| Missing Evidence | Impact on Assessment |
|---|---|
| None significant | Primary source fully confirms the claim |
Researcher Bias Check¶
Declared biases: The researcher's methodology incorporates the IPCC model. Influence assessment: Low risk — factual description of a published framework.
Revisit Triggers¶
| Trigger | Type | Check |
|---|---|---|
| IPCC AR7 revises the confidence framework | policy | Check IPCC guidance notes for AR7 |
| IPCC changes the terminology for evidence quality or agreement axes | policy | Monitor IPCC methodology publications |