Interlaboratory Proficiency Testing for Textile Laboratories
topic
Textile laboratory proficiency testing schemes circulate homogeneous fabric, yarn, or colour specimens to participating laboratories for testing under normal conditions, comparing each laboratory result against assigned values using z-scores that express deviation in units of target standard deviation, with action criteria at absolute z greater than three and warning at absolute z greater than two.
Role
Provides independent external validation of laboratory measurement performance beyond internal quality control, satisfying ISO 17025 proficiency testing participation requirements and identifying laboratories with systematic bias or excessive precision problems that internal calibration and quality control procedures have failed to detect.
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