; (B) if individuals under the age of 18 are employed at the facility of the direct supplier or on-site service provider, interview a representative group using age-sensitive interview techniques; (C) conduct interviews— (i) on-site and, particularly in cases where there are indications of egregious violations about which employees may hesitate to discuss at work, off-site of the facility and during non-work hours; and (ii) individually or in groups (except for purposes of subparagraph (B)); (D) use audit tools to ensure that each worker is asked a comprehensive set of questions; (E) collect from interviewed workers copies of the workers’ pay stubs, in order to compare the pay stubs with payment records provided by the direct supplier; (F) ensure that all worker responses are confidential and are never shared with management; and (G) interview a representative of the labor organization or other worker representative organization that represents workers at the facility or, if no such organization is present, attempt to interview a representative from a local worker advocacy group. (2) Management interviews The auditor shall— (A) interview a cross-section of the management of the supplier, including human resources personnel, production supervisors, and others; and (B) use audit tools to ensure that managers are asked a comprehensive set of questions. (3) Documentation review The auditor shall— (A) conduct a documentation review to provide tangible proof of compliance and to corroborate or find discrepancies in the information gathered through the worker and management interviews