5. Our advice
5.1 Use proficiency test results to improve your measurements
Proficiency testing is thought to exist because :
Accreditation has become an obligation for any laboratory wishing to sell its services or, more simply, belonging to a quality-assured company;
required by Cofrac auditors;
As a result, analysts tend to regard them as a kind of "pensum" to be got rid of as cheaply as possible. This is a pity, because CILs are a remarkable way of understanding the critical points of a method... provided that you take part in the meetings at which the results are analysed. This seems to be increasingly rare, if test organizers are to be believed.
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Bibliography
Feinberg M., Bugner E., Theiller G. Houba X., Kadijk F. Expression of the reference value for proficiency tests (1995) J. of Chemometrics 9, 197-209
ISO 13528:2002, Statistical methods used in proficiency testing by inter-laboratory comparisons (2002) ISO, Geneva (under revision)
ISO 17043:2007, Conformity assessment. General requirements...
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