While there are a number of uses for interlaboratory tests, and variations in their design and implementation, it is still possible to specify the essential principles that need to be considered when organizing such tests.
Formerly under the jurisdiction of Committee E36 on Accreditation Certification, this guide was withdrawn in July 2012 in accordance with section 10.5.3.1 of the Regulations Governing ASTM Technical Committees, which requires that standards shall be updated by the end of the eighth year since the last approval date.
1.1 While there are a number of uses for interlaboratory tests, and variations in their design and implementation, it is still possible to specify the essential principles that need to be considered when organizing such tests. Part A of this guide defines those principles and describes the factors that should be taken into account in the organization and conduct of proficiency testing programs.
1.2 This guide also covers how laboratory accrediting bodies, which assess technical competence of testing laboratories, should select and use proficiency testing programs (refer to Part B).
1.3 Part A of the guide is intended for use by various parties, such as accrediting bodies, regulatory authorities and clients of laboratory services which have a need to assess the technical competence of laboratories. It is also useful for laboratories in self-evaluation, but recognizes that proficiency testing is only one mechanism that can contribute to establishing equivalent confidence among users of different testing laboratories.
1.4 It is currently a condition of some accreditation bodies that laboratories participate regularly in "approved" proficiency testing programs. Therefore, it is essential that program operators comply with principles for conduct of professionally managed proficiency programs, both in terms of technical requirements and quality management (see Annex A1 and Annex A2).
1.5 The methods of operation within different proficiency testing organizations are not expected to be identical and this guide does not give specific operational details for interlaboratory test comparisons. It does, however, cover both measurement comparison and testing programs in which large numbers of laboratories (over 20) or small groups of laboratories (1 to 20) are tested. Therefore, the contents of this guide are intended only as a framework to be modified appropriately for particular situations.
1.6 A list of some relevant references is given in Appendix X1.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
E178 Practice for Dealing with Outlying Observations
E456 Terminology Relating to Quality and Statistics
E548 Guide for General Criteria Used for Evaluating Laboratory Competence
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
E1187 Terminology Relating to Laboratory Accreditation
ANSI/ISO/ASQCQ9000 Series: Quality Management and Quality Assurance Standards
ISOGuide30, Terms and Definitions Used in Connection with Reference Materials
interlaboratory comparison; laboratory; laboratory accreditation; proficiency testing;
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Citing ASTM Standards
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