Trancoso, Maria AscensãoSousa, Ana R.Calisto, Sandra C.2015-02-042015-02-042014Trancoso, M.A.; Sousa, A.R.; Calisto, S. - Monitoring laboratory performance over time from proficiency testing by interlaboratory comparisons. In: Eurachem: Workshop on Quality in Analytical Measurements from Specification to Decision, Book of Abstracts, Lisbon, Portugal, 19-21 May, 2014, p. 59http://hdl.handle.net/10400.9/2594Proficiency testing by interlaboratory comparisons is used to determine the individual performance of a laboratory for a specific test or measurement and to monitor the continuing performance of laboratories. Monitoring PT performance over time allows to identify potential problems related to random and systematics errors. Participation in interlaboratory comparison tests (IEC), is a requirement of the accreditation bodies either for granting laboratory accreditation by EN ISO/IEC 17025:2005 as external quality control.engQuality controlLaboratories--StandardizationPerformance testsconference object