Faceless assessment: National Assessment Centres to standardise classification, valuation and compliance across commodity-based assessments. National Assessment Centres (NACs) are commodity-wise specialised units under faceless assessment, convened by a Pr. Chief/Chief Commissioner, selected on import-volume criteria, and mandated to monitor and harmonise classification, valuation, exemption application and compliance. NACs review assessment practices and audit objections, analyse RMS-facilitated Bills of Entry for assigned chapters, advise on risk parameter interventions, examine appellate and assessment orders for uniformity, constitute working groups on assessment, valuation, classification and restrictions, and coordinate with central formations for alerts, valuation expertise, risk feedback, capacity building, audit issues and system enhancements.