The purpose of this guide is to assist participants, accreditation bodies, and assessors, as they interpret andanalyze the reports issued by the National Association for Proficiency Testing. It is NAPT’s hope that withgreater understanding comes increased value to those who participate in any ILC/PT. In the event you havea need for even greater details regarding the services NAPT offers to the Metrology Community, please direct any questions to NAPT’s Managing Director.