Consistency of entity claims across all representations. Audit quarterly: website schema vs Wikidata vs directories vs social profiles. Check: entity name, industry classification, location, founding date, key relationships. Inconsistency triggers disambiguation failure and confidence degradation. Common errors: different industry codes, conflicting founding dates, inconsistent entity names. Maintain through centralized schema governance. Update all representations simultaneously when entity attributes change. Schema incoherence is unforced error — AI systems can’t distinguish you when your own representations conflict.