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  • ASTM
    E2164-24b Standard Test Method for Directional Difference Test (Redline)
    Edition: 2024
    $113.57
    Unlimited Users per year

Description of ASTM-E2164 2024

ASTM E2164-24b

Redline Standard: Standard Test Method for Directional Difference Test




ASTM E2164

Scope

1.1 This test method covers a procedure for comparing two products using a two-alternative forced-choice task.

1.2 This method is sometimes referred to as a paired comparison test or as a 2-AFC (alternative forced choice) test.

1.3 A directional difference test determines whether a difference exists in the perceived intensity of a specified sensory attribute between two samples.

1.4 Directional difference testing is limited in its application to a specified sensory attribute and does not directly determine the magnitude of the difference for that specific attribute. Assessors must be able to recognize and understand the specified attribute. A lack of difference in the specified attribute does not imply that no overall difference exists.

1.5 This test method does not address preference.

1.6 A directional difference test is a simple task for assessors, and is used when sensory fatigue or carryover is a concern. The directional difference test does not exhibit the same level of fatigue, carryover, or adaptation as multiple sample tests such as triangle or duo-trio tests. For detail on comparisons among the various difference tests, see Ennis (1), MacRae (2), and O'Mahony and Odbert (3).2

1.7 The procedure of the test described in this document consists of presenting a single pair of samples to the assessors.

1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.9 This 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.


Keywords


ICS Code

ICS Number Code 19.020 (Test conditions and procedures in general)


DOI: 10.1520/E2164-24B

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About ASTM

ASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide.
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