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I am working to develop a questionnaire in order to verify and evaluate an auditor's competence in Environmental Management System Auditing. ISO 17021-2:2015 has a basic outline for the knowledge that must be demonstrated, but I'm looking for a little help creating questions from this outline to ask a competent EMS auditor that would allow them to demonstrate their competence effectively. Does anyone have any suggested questions or know of a book/website where I can find more information? If you are an EMS lead auditor, what are some questions you have been asked to demonstrate your competence?