ASTM D3244-20

1.1This practice covers guidelines and statistical methodologies with which two parties, usually a supplier and a receiver, can compare and combine independently obtained test results to obtain an Assigned Test Value (ATV) for the purpose of resolving a product quality dispute.

1.2This practice defines a technique for establishing an Acceptance Limit (AL) to determine acceptance or rejection of the product in dispute by comparing an ATV to the AL.

1.3This practice applies only to those test methods which specifically state that the repeatability and reproducibility values conform to the definitions herein.

1.4The statistical principles and methodology outlined in this practice can also be used to obtain an ATV for specification conformance decision when multiple results are obtained for the same batch of product within a single laboratory. For this application, site precision (R') as defined in Practice D6299 shall be used in lieu of test method published reproducibility (R).

1.5This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.