Zone de Texte: Accreditation for ISTA methods only Mandatory proficiency tests Audit every 3 years Auditors familiar with the methods 35 work sheets may soon become part of the accreditation scheme Zone de Texte: ISTA accreditation is specific Zone de Texte: Accreditation for ISTA methods only Mandatory proficiency tests Audit every 3 years Auditors familiar with the methods 35 work sheets may soon become part of the accreditation scheme Zone de Texte: ISTA accreditation is specific

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