|Year of Declaration||2008|
|Number of Pages||16|
While there are a number of uses of interlaboratory comparisons, and variations in their design and implementation, it is still possible to specify the essential principles that need to be considered when organizing such comparisons. This part of ISO/IEC Guide 43 defines those principles and describes the factors which should be taken into account in the organization and conduct of proficiency testing schemes. It is intended for use by proficiency testing operators and users such as participant laboratories, accreditation bodies, regulatory authorities and clients of laboratory services who need to assess the technical competence of laboratories. It is particularly useful for laboratories in self-evaluation, but recognizes that proficiency testing is only one mechanism which can contribute to the establishment of mutual confidence between users of different testing laboratories. The principles of conduct of professionally managed proficiency schemes, both in terms of technical requirements, statistical procedures (examples in annex A) and in quality management (guidance in annex B). The contents of this Guide is intended only as a framework to be modified appropriately for particular situations including schemes with either small or large number of participants. It is not intended to cover a technique often used by organizations to evaluate a single laboratory's performance through submissions of certified reference materials or other well-characterized test items.