Scott: One of the ways of assessing a test that does not require watching someone move things, and push things, and pour things, is to have a checklist that takes the assessor through the procedure, its validation, the supporting procedures, the equipment, the people, the results, the QA, traceability, sample handling and reporting, and the records associated with these things - all in the space of about an hour.
Going through this, while talking to the technician / analyst will give the assessor a pretty good idea that the lab has the people, with the skills and knowledge; the environment with the facilities and equipment; the QC/QA and QMS; and the procedures required to produce technically valid results (which is the Principle of Capacity behind 17025).
Not hard to do and setting up complicated test equipment for the assessment is not really needed. Having records that demonstrate competence is. And the assessor must be competent in that test as well.
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