sama objekti korduval mõõtmisel sama mõõtmisvahendiga erinevate isikute poolt läbiviidavates erinevates katsetes saadavate tulemuste lähesus, the closeness of agreement between independent results obtained with the same method onidentical test material but under different conditions (different operators, different apparatus, differentlaboratories and/or after different intervals of time)