4.7.1.5 The proficiency testing provider shall have documented criteria and procedures for dealing with test results that may be inappropriate for statistical evaluation, e.g. miscalculations, transpositions and other gross errors.
4.7.1.6 The proficiency testing provider shall have documented criteria and procedures to identify and manage proficiency test items that have been distributed and are subsequently found to be unsuitable for performance evaluation, e g because of inhomogeneity, instability, damage or contamination.
4.7.2 Evaluation of performance
4.7.2.1 The proficiency testing provider shall use valid methods of evaluation which meet the purpose of the proficiency testing scheme. The methods shall be documented and include a description of the basis for the evaluation. The evaluation of performance shall not be subcontracted (see 5.5.2).
4.7.2.2 Where appropriate for the purpose of the proficiency testing scheme, the proficiency testing provider shall provide expert commentary on the performance of participants with regard to the following:
a) overall performance against prior expectations, taking measurement uncertainties into account;
b) variation within and between participants, and comparisons with any previous proficiency testing rounds, similar proficiency testing schemes, or published precision data;
c) variation between methods or procedures;
d) possible sources of error (with reference to outliers) and suggestions for improving performance;
e) advice and educational feedback to participants as part of the continual improvement procedures of participants;
0 situations where unusual factors make evaluation of results and commentary on performance impossible;
g) any other suggestions, recommendations or general comments; and
h) conclusions.
NOTE It can be useful to provide individual summary sheets for participants periodically during or after completion of a particular proficiency testing scheme. These can include updated summaries of performance for individual participants over successive proficiency testing rounds of a continuous proficiency testing scheme Such summaries can be further analysed and trends highlighted, if required.
4.8 Reports
4.8.1 Proficiency test reports shall be clear and comprehensive and include data covering the results of all participants, together with an indication of the performance of individual participants. The authorization of the final report shall not be subcontracted (see 5.5.2).
NOTE Where all original data cannot be reported to participants, a summary of the results, e.g. in tabulated or graphical form, can be supplied.
4.8.2 Reports shall include the following, unless it is not applicable or the proficiency testing provider has valid reasons for not doing so:
a) the name and contact details for the proficiency testing provider:
b) the name and contact details for the coordinator;
c) the name(s), function(s). and signature(s) or equivalent identification of person(s) authorizing the report;
d) an indication of which activities are subcontracted by the proficiency testing provider;
e) the date of issue and status (e.g. preliminary, interim, or final) of the report;
f) page numbers and a clear indication of the end of the report;
g) a statement of the extent to which results are confidential;
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