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Interlaboratory studies represent a form of external quality control for laboratories. International standards that are used for interlaboratory comparisons, ISO 17043, ISO 13528, ISO 5725, define ways of organisation of comparisons and data treatment of participating laboratories’ results. Intercomparison results can be exploited, apart from the main goal for laboratory performance evaluation, also for method validation and production of Certified Reference Materials. PROLab is a comprehensive, globaly accepted and standardized software package for evaluating interlaboratory studies. It provides large data set structures, graphical and
computational methods for optimal use of the data. Directorate of Measures and Precious Metals has purchased and installed software package PROLab Plus, licenced as the only one in the Republic of Serbia. As such, it will be available to all interested organisers of interlaboratory comparisons, in our country.
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 PROLab Plus Manual (2015). QuoData GmbH.
 ISO IEC 17043 (2010) Conformity assessment – General requirements for proficiency testing
 ISO 5725, Accuracy (trueness and precision) of measurement methods and results
 ISO 5725-1:1994, Part 1: General principles and definitions
 ISO 5725-2:1994, Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method
 ISO 5725-3:1994, Part 3: Intermediate measures of the precision of a standard measurement method
 ISO 5725-4:1994, Part 4: Basic methods for the determination of the trueness of a standard measurement method
 ISO 5725-5:1998, Part 5: Alternative methods for the determination of a standard measurement method
 ISO 5725-6:1994, Part 6: Use in practice of accuracy values
 ISO/IEC 13528, “Statistical methods for use in proficiency testing by interlaboratory comparisons“.