AOAC GFA Stakeholder Program Meeting Book (August 27, 2023)

Current Definition VIM4 Second Committee Draft Definition

3.28 Repeatability: Precision under repeatability conditions. (ISO 5725 1).

measurement repeatability repeatability measurement precision under repeatability conditions NOTE Repeatability may be evaluated by replicate measurements on similar objects, provided variability among the objects is negligible. specified conditions of measurement where indications or measured values are obtained by replicate measurements with the same measurement procedure on the same or similar objects in the same laboratory by the same operator using the same measuring system within a short period of time NOTE The short period of time mentioned in the definition is intended to be as short as necessary in order to avoid the occurrence of changes in the specified conditions (see ISO 5725-1 [13], section 4.4) measurement reproducibility reproducibility measurement precision under reproducibility conditions NOTE 1 Reproducibility may be evaluated by replicate measurements on similar objects, provided variability amongthe objects is negligible. NOTE 2 Relevant statistical terms are given in ISO 5725-1 and ISO 5725-2 [13]. repeatability conditions of measurement repeatability conditions

3.29 Repeatability Conditions: Conditions where independent test results are obtained with the same method on equivalent test items in the same laboratory by the same operator using the same equipment within short intervals of time. 3.30 Reproducibility: Precision under reproducibility conditions (ISO 5725 1).