Enquiry procedure under wage law complaints covers summons, evidence, defence, and decision on the complaint. Rule 53 sets out the procedure for holding an enquiry on a complaint before the officer under section 53. It permits complaints by an authorised officer, an aggrieved employee, a registered trade union, or an Inspector-cum-Facilitator, and requires summons if the officer considers an offence has been committed. The rule then provides for explanation of the complaint, admission of guilt and penalty under the Code, or otherwise examination and cross-examination of witnesses, recording of oral and documentary evidence, opportunity of defence, and decision on the complaint on the basis of all evidence.