ASTM E691-21 PDF Download

A standard process known as ASTM E691-21 describes how to perform an interlaboratory study (ILS) to ascertain the accuracy of a test method. The goal of this exercise is to compile the data required to create a precision statement for the test procedure. The standard offers instructions for organizing, carrying out, deciphering, and evaluating the outcomes of the interlaboratory investigation.

The statistical methods outlined in ASTM E691-21 are intended to give testers enough data to formulate the test method's precision statement. All test methods must include this precision statement as required by ASTM rules, and it is useful for scientific and commercial work when comparing test results to reference values or to data from various sources.

It's crucial to remember that ASTM E691-21 concentrates on test procedures that produce a single numerical figure as the test outcome, even though this figure may be computed from a collection of data. Although it admits that categorical outcomes can be scored and summarized for specific reasons, the standard does not apply to methods that use them.