TS ISO 5725-2

TS ISO 5725-2. OFFICIAL SCOPE IS UNAVAILABLE. This standard is Part 2 of the ISO 5725 series on the accuracy of measurement methods and results, focusing on the relationship between trueness, precision, repeatability, and reproducibility. Its subject is how to assess whether a standard measurement method gives closely matching results under the same conditions and how much those results vary when the conditions broaden to include different laboratories or other sources of variation.

What repeatability and reproducibility mean

In general technical use, repeatability describes how close results are when the same method is applied under the same laboratory conditions, with the same equipment and similar operating circumstances. Reproducibility describes the degree to which results remain comparable when measurements are carried out across laboratories, operators, or time. This distinction matters because a method may appear stable in one setting yet behave differently when used more broadly.

Evaluating a standard measurement method

The core idea behind this type of standard is to characterise measurement-method performance by separating sources of variability statistically. That kind of assessment is widely relevant in interlaboratory studies, method validation work, quality assurance programmes, and the use of reference materials. The emphasis is not on a single reading, but on how the method behaves across the conditions that affect measurement results.

As the title indicates, this document addresses the basic method for determining repeatability and reproducibility of a standard measurement method; however, because the full scope text is not available in this record, specific procedures or numerical acceptance limits should not be assumed. Even so, standards in this area provide a shared technical language for comparing results and interpreting laboratory data consistently.