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Neither the ISO standard or the TS2 specification requires formal auditor traing. Customer requirements will dictate any additional qualifications/training.
Asking the question "How do you know that your auditors are competent?" is not an intelligent question. It is the responsibility of the registrars auditor to make that determination as they audit the process.
Asking the question "How do you know that your auditors are competent?" is not an intelligent question. It is the responsibility of the registrars auditor to make that determination as they audit the process.