What best describes reproducibility?

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Reproducibility refers to how well a measurement can be repeated when different operators, different instruments, or different setups are used to perform the same test. It shows how much results vary due to the measuring system itself when those factors change. The aim is to have small differences across operators and devices, indicating the method yields consistent results regardless of who or what is used. This is why the description of variation between operators, instruments, or setups best matches reproducibility. Variation under the same conditions is about repeatability—the consistency of results when the measurement is repeated with the same setup. Environmental factors can contribute to variability, but reproducibility specifically highlights differences caused by changing who or what performs the measurement. Variation observed over time relates to drift or stability, not cross-condition consistency.