Advance Ruling clarifies duty liability for proposed activities, providing binding determinations for applicants and their commissionerate. Advance rulings under the Central Excise Act permit pre transaction determinations on classification, valuation, exemption applicability, notification interpretation, input/service tax or excise credit admissibility, and liability to excise duty for proposed production or manufacturing activities. The three member Authority has civil court powers and procedural autonomy, may accept or reject applications, and must hear applicants or representatives; rulings bind only the applicant and the commissionerate and are void ab initio if obtained by fraud or misrepresentation.