https://doi.org/10.1351/goldbook.08085
Intralaboratory comparison or interlaboratory comparison with the aim of assigning a reference quantity value to a quantity with stated measurement uncertainty or value to a reference nominal property value with stated examination uncertainty.
Notes:
- A material characterization study often utilizes selected (routine or reference) laboratories to measure quantity values of a candidate reference material by measurement procedure(s) judged most likely to provide the smallest associated measurement uncertainty.
- Although proficiency testing is not primarily intended as a material characterization study, reference materials are sometimes certified on the basis of results from a proficiency testing scheme after appropriate quality assurance procedures.