R0002/2026-03-13/C003 — Assessment¶
BLUF¶
The IPCC two-axis confidence model, evidence and agreement axes, and five confidence levels are all confirmed. The claim contains terminology imprecisions: "Source agreement" should be "degree of agreement," and "Evidence quality" should be "evidence." The "nine-point" likelihood scale count is debatable — the IPCC presents seven primary terms with three supplementary terms (ten total). Nine is defensible only by excluding one supplementary term.
Probability¶
Rating: Likely (55-80%)
Confidence in assessment: High
Confidence rationale: The IPCC guidance note (confirmed via secondary sources) and multiple independent academic and science communication sources converge on the framework structure. The counting ambiguity for the likelihood scale is genuine but does not reflect a gap in evidence — it reflects an inherent flexibility in the IPCC's vocabulary.
Reasoning Chain¶
- The claim asserts a two-axis confidence model with evidence (Limited, Medium, Robust) and source agreement (Low, Medium, High) axes, five confidence levels, and a nine-point likelihood scale. [Claim text]
- The two-axis model is confirmed — IPCC confidence is explicitly based on assessments of evidence and degree of agreement. [SRC01-E01, High reliability, High relevance]
- Evidence axis labels (Limited, Medium, Robust) are confirmed, though the axis is officially "evidence" not "evidence quality." [SRC01-E02]
- Agreement axis labels (Low, Medium, High) are confirmed, though the axis is officially "degree of agreement" not "source agreement." [SRC01-E03]
- Five confidence levels (Very low, Low, Medium, High, Very high) are confirmed. [SRC01-E04]
- A separate likelihood scale exists with seven primary terms. [SRC01-E05]
- Including three supplementary terms yields ten total. [SRC02-E01]
- Inference: The "nine-point" count requires counting seven primary terms plus two supplementary (Extremely likely, Extremely unlikely) while excluding "More likely than not." This is a defensible but non-standard counting method.
- Conclusion: Rating of "Likely" reflects that the framework description is structurally correct but contains terminology imprecisions and a debatable count. Sub-claims 003a-003d are each "Almost certain." Sub-claim 003e (nine-point) is "Roughly even chance."
Evidence Base Summary¶
| Source | Description | Reliability | Relevance | Key Finding |
|---|---|---|---|---|
| SRC01 | IPCC AR5 Guidance Note | High | High | Two-axis model, five confidence levels, seven primary likelihood terms |
| SRC02 | GreenFacts IPCC Summary | Medium-High | High | Complete likelihood table: seven + three supplementary = ten terms |
Collection Synthesis¶
| Dimension | Assessment |
|---|---|
| Evidence quality | High — IPCC primary guidance plus multiple concordant secondary sources |
| Source agreement | Full agreement on framework structure; counting ambiguity is inherent, not a dispute |
| Source independence | High — IPCC guidance, academic analyses, and science communication sources converge independently |
| Outliers | None |
Detail¶
All sources agree on the framework structure: two axes, three labels per axis, five confidence levels, and a separate likelihood vocabulary. The only analytical challenge is counting the likelihood terms. The IPCC guidance presents them as a flexible vocabulary with primary and supplementary terms, not as a fixed-length scale. The claim's "nine-point" characterization imposes a counting method that is defensible but non-standard. No source presents the scale as "nine-point." The most common presentations use seven (primary only) or reference the full vocabulary without assigning a specific count.
Gaps¶
| # | Missing Evidence | Impact on Assessment |
|---|---|---|
| 1 | IPCC AR5 Guidance Note full text (PDF unreadable) | Low — content confirmed via secondary sources |
| 2 | Exact count of terms used in practice across IPCC reports | Would clarify whether nine terms are commonly used in practice vs. the full ten |
The inability to read the IPCC guidance note PDF directly is a limitation shared with Claim 001's ICD 203 PDF issue. However, the GreenFacts summary faithfully reproduces the IPCC definitions with direct quotes, and the framework structure is not in dispute.
Researcher Bias Check¶
Declared biases: Author may be inclined to see structural parallels with IC frameworks, potentially leading to imprecise characterization of the IPCC framework in IC-like terms ("Source agreement" echoes IC language).
Influence assessment: The terminology imprecisions ("Source agreement" vs. "degree of agreement," "Evidence quality" vs. "evidence") are consistent with the declared bias — the researcher may have unconsciously translated IPCC terms into more familiar IC-adjacent language. The nine-point count may reflect an attempt to create a neat parallel with the ICD 203 seven-point scale. These biases were detected but not corrected by the researcher's original analysis.
Cross-References¶
| Entity | ID | File |
|---|---|---|
| Hypotheses | H1, H2, H3 | hypotheses/ |
| Sources | SRC01, SRC02 | sources/ |
| ACH Matrix | 003 | ach-matrix.md |
| Self-Audit | 003 | self-audit.md |