Proficiency Testing Australia Status of EA Interlaboratory Comparisons APLAC Interlaboratory Proficiency Testing Committee National Association for Proficiency Testing-NAPT European Information System on Proficiency Testing Schemes-EPTIS ASTM's Statistical Quality Assurance Programs Collaborative Testing Services-(CTS) AASHTO Materials Reference Laboratory Proficiency Sample Program US DOE New Brunswick Laboratory-Measurement Evaluationand Reference Materials National Research Council of Canada's Certified Reference Materials Canadian Association For Environmental Analytical Laboratories-(CAEAL) NATA Proficiency Testing Analytical Reference Materials International Institute for Interlaboratory Studies AOAC Laboratory Proficiency Testing Program EC Institute for Reference Materials and Measurements-(IRMM) Automatic RF Techniques Group - Measurement_Comparison_Program-(ARFTG) HN Proficiency Testing-HN CTL Proficiency Testing Programmes-(CTL) PRI/NADCAP Proficency Testing American Proficency Institute-(API) JLNA Proficiency Testing Programs CLNA Proficiency Testing Programs North American Soil and Plant Analysis Proficiency Testing Program - (NAPT) United States Golf Association Proficiency Testing - (USGA-PT) Compost Analysis Proficiency Testing Program - (CAP) Aquacheck Proficiency Testing Scheme LGC Profeciancy Testing Schemes - (LGC) Chemistry PTS schemes - (NMi) International Union of Independent Laboratories - (UILI-ILP) PTA programs
