Customs Single Window streamlines import clearance through real time agency exchanges and electronic release orders for faster cargo movement. Customs administration implements levy and collection of duties under the Customs Act and Customs Tariff, with ad valorem valuation governed by Section 14 and WTO-based valuation rules. The Board pursues trade facilitation through an electronic Single Window and other measures (reduced documents, digital signatures, CCFCs, streamlined IGM/SMTP submissions) while maintaining regulatory controls via notified ports/ICDs/LCSs, custodian and carrier obligations, preventive powers, staged appraisal/examination and enforcement including seizure, prosecution and appellate remedies.