E.Batch characterisation:U.K.
the methods used for verification and for certification must:
be applied under metrologically valid conditions,
have been properly technically validated before use,
have precision and accuracy compatible with the target uncertainty;
each set of measurements must:
be traceable to the stated references, and
be accompanied by an uncertainty statement whenever possible;
participating laboratories must:
have the required competence for the execution of the task,
be able to achieve traceability to the required stated references,
be able to estimate its measurement uncertainty,
have in place a sufficient and appropriate quality assurance system.