H002 Review

• Hypothesis ID: H002
• Name: Representation Independence
• Current statement: Procedural structure may remain more stable than any single surface representation.
• Research question: Does recovered structure remain meaningfully stable when surface representation changes?
• Prior direction and strength: active / low-moderate
• Prior kill-condition status: not_tested

Evidence Supporting

• EXP-002 completed all expected records and maintained full representation compliance. Source: research/evidence-runs/ECR-000003-representation-sensitivity/experiments/EXP-002-cross-representation-stability/comparison/generated-v3.1/exp-002-comparison-summary.md
• EXP-003 reported mostly_stable backbone, conceptual profile, and dimensional profile across domain variants. Source: research/evidence-runs/ECR-000003-representation-sensitivity/experiments/EXP-003-isomorphic-procedures/comparison/generated-v3.1/comparison-summary.md

Evidence Challenging

• EXP-002 still reported primitive disagreement and constraint disagreement. Source: research/evidence-runs/ECR-000003-representation-sensitivity/experiments/EXP-002-cross-representation-stability/comparison/generated-v3.1/exp-002-comparison-summary.md
• Explainability still surfaced material structural divergences and high-priority review items. Source: research/evidence-runs/ECR-000003-representation-sensitivity/comparison/ECR-000003-explainability-summary.md

Mixed Evidence

• Backbone stability appears stronger than primitive or constraint stability, but the evidence does not justify treating representation changes as harmless. Sources: research/evidence-runs/ECR-000003-representation-sensitivity/pipeline/generated/ecr-000003-comparison-summary.md, research/evidence-runs/ECR-000003-representation-sensitivity/ECR-000003-FINDINGS.md

Provider, Representation, and Domain Effects

• Provider effects remain visible, which weakens any strong claim that representation alone explains the observed stability.
• Representation effects appear smaller at the backbone layer than at the primitive and constraint layers.
• Domain effects in EXP-003 did not erase backbone similarity, but they still affected recognition and detail layers.

Relevant Instrument Findings

• Comparator 3.1.0 remains frozen for accepted measurement.
• Comparator 3.2.0 explainability supports a backbone-versus-detail distinction, but does not remove ambiguity.

Threats

• representation-format effects
• prompt-induced structure
• missing human baseline
• comparator-dependent interpretation

Alternative Explanations

• Apparent stability may reflect comparator abstraction rather than true representation independence.
• Shared packet schema may constrain outputs enough to create partial similarity regardless of representation.

Kill Condition

• Current kill condition: primitive, AST, constraint, and natural-language representations produce unrelated results.
• Status: tested_not_met

Proposed Direction

slightly_supported

Proposed Evidence Strength

weak

Board Recommendation

retain

Rationale

The evidence supports limited backbone-level robustness across representations, but not a stronger claim of broad representation independence.

Next Evidence Needed

• negative non-isomorphic controls
• human baseline extraction
• repeated representation-family calibration

Human Decision

• Decision:
• Reviewer:
• Date: