{"id":"EXP-003","area":"Measurement and Experimentation","title":"Use a change ledger","if":"any SEO-relevant production change occurs","then":"assign a change ID, owner, scope, time, expected mechanism, and rollback state","else":"retain the previous ledger","operators":["IF","THEN","ELSE","AND"],"laka_levels":["Structural"],"primary_metric":"change attribution coverage","guardrails":"logging overhead","rationale":"Makes the decision explicit, measurable, and reversible where possible.","prefix":"EXP","area_slug":"measurement-and-experimentation","source":{"document":"04","file":"04-IF-ELSE-AND-OR-RULEBOOK.md","heading":"EXP-003 — Use a change ledger","anchor":"exp-003-use-a-change-ledger"},"sentence":"IF any SEO-relevant production change occurs THEN assign a change ID, owner, scope, time, expected mechanism, and rollback state ELSE retain the previous ledger","area_detail":{"name":"Measurement and Experimentation","slug":"measurement-and-experimentation","prefix":"EXP","count":12},"governs_gates":["measurement"],"precedence":["safety_law_privacy_policy","user_value_and_accuracy","technical_eligibility_and_canonical_correctness","business_value_and_constraints","intent_fit_and_information_quality","measurement_and_learning","efficiency_and_scale","cosmetic_optimization"],"neighbours":["EXP-001","EXP-002","EXP-004","EXP-005","EXP-006","EXP-007","EXP-008","EXP-009","EXP-010","EXP-011","EXP-012"],"levels":[{"id":"structural","name":"Structural","definition":"Relationships, architecture, ownership, or workflow change.","examples":["Examples:","merge cannibalizing pages","redesign cluster architecture","change templates","repair faceted navigation","move from isolated pages to a hub graph","connect CRM value data to SEO reporting"],"rule_count":62,"source":{"document":"01","file":"01-SEO-LAKA-GRAMMAR.md","heading":"10.4 Structural change"}}]}