NAPT provides proficiency testing services and related tools to its customers. The only consulting NAPT offers is associated with its products. NAPT does not provide consultancy for the development of uncertainty budgets, corrective action investigations, root cause analysis, or other functions as a result of an unsatisfactory performance in a proficiency test (PT). In accordance with the ISO 17043 standard, NAPT offers independent, third-party PTs and believes the provision of consulting services associated with these functions would jeopardize their independence.