Audit Substitution names a recurring structural move in complex systems: thereplacement of substantive understanding with auditable artifacts. Under scrutiny,what matters is not only what is true or effective, but what can be verified by thirdparties through records, metrics, checklists, and traceable evidence. Systemstherefore behave as if they optimize for auditability—forms of proof that arerepeatable, inspectable, and defensible—often at the expense of nuanced judgment,context sensitivity, or causal understanding. This document defines AuditSubstitution as an impersonal lens. It does not attribute intent, does not nameinstitutions, and does not prescribe actions. It specifies observable traces (metricgrowth, documentation expansion, checklist primacy, proxy selection, and exceptionhandling) and provides minimal validity conditions to keep claims structural andnon-ideological. Audit Substitution is presented as a companion operation toDescriptive Closure (ICF-0): when a system cannot afford full explicitness, it oftenconverts reality into auditable proxies. It also complements Decision Displacement(ICF-1): when a system cannot fully commit, auditable movement can substitute fordecisive ownership.