To assess the technical competence of calibration laboratories, national accreditation bodies (NABs) take into account the results of national and/or international proficiencies testing (PTs) including the inter-laboratory comparisons (ILCs). As the Italian NAB stopped acting as PT provider since 2015 due to the result of a peer assessment by the European co-operation for accreditation, the National Institute of Metrological Research (INRIM) reorganized itself and reoriented part of its activity to become a ILCs provider, thus supporting the calibration laboratories. This paper describes how INRIM has been organized as ILCs provider to guarantee the accreditation activity continuation and gives information about the main typologies of the provided ILCs and details on the analysis of the ILCs results in different metrological areas. From 2016 to 2018, INRIM provided 114 ILCs, in the areas of acoustics ultrasonic and vibration, electricity and magnetism, length (L), mass (M) and thermometry (T), involving 138 laboratories, for which 375 ILC reports were issued.

为了评估校准实验室的技术能力，国家认证机构（NAB）考虑了国家和/或国际能力测试（PT）的结果，包括实验室间的比较（ILC）。自2015年以来，由于意大利合作银行因欧洲合作认证同行评估的结果而不再担任PT提供方，国家计量研究所（INRIM）进行了重组，并将其业务的一部分重新定位为成为ILC的提供方，从而支持校准实验室。本文介绍了如何组织INRIM作为ILC的提供者，以确保认证活动的持续进行，并提供有关所提供ILC的主要类型的信息，以及有关在不同计量领域对ILC结果进行分析的详细信息。L），质量（M）和测温法（T），涉及138个实验室，并发布了375个ILC报告。