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  • BSI
    BS ISO 8588:2017 Sensory analysis. Methodology. \"A\". \"not A\" test
    Edition: 2017
    $313.97
    / user per year

Description of BS ISO 8588:2017 2017

This document specifies a procedure for determining whether a perceptible sensory difference exists between samples of two products. The method applies whether a difference exists in a single sensory attribute or in several.

The “A” – “not A” test can be used in sensory analysis in the following ways:

  1. as a difference test, particularly for evaluating samples having variations, for example, in appearance (making it difficult to obtain strictly identical repeat samples) or in aftertaste (making direct comparison difficult);

  2. as a recognition test, particularly for determining whether an assessor or group of assessors identifies a new stimulus in relation to a known stimulus (for example, recognition of the quality of the sweet taste of a new sweetener);

  3. as a perception test, to determine the ability of an assessor to discriminate stimuli.

The “A” – “not A” test is not appropriate for assessing if two products are sufficiently similar to be used interchangeably (i.e. for similarity testing) because the “A” – “not A” test inherently involves replicate evaluations of the same products by all assessors. These replicate evaluations violate the basic assumptions for similarity tests to be statistically valid.

Examples of its application are given in Annex B.

NOTE Bi and Ennis[1] point out that the estimate of the discriminal distance, d’, between the “A” and “not A” samples is the same regardless of the nature of the replicated evaluations performed in the test but that the estimate of the variance of d’ does depend on how the replicate evaluations were performed. As such, no general discussion of a Thurstonian analysis of the “A” – “not A” method, nor of the power of the test is undertaken in this document. Interested readers are referred to Reference [1] for a detailed discussion of the topic.



Standard NumberBS ISO 8588:2017
TitleSensory analysis. Methodology. "A". "not A" test
StatusUnder Review
Publication Date2017-07-31
ReplacesBS 5929-5:1988
Identical National Standard OfISO 8588:2017
DescriptorsTesting conditions, Mathematical calculations, Specimen preparation, Taste tests, Food testing, Statistical methods of analysis, Comparative tests, Sensory analysis (food), Equations
ICS67.240 Sensory analysis
CommitteeAW/12
ISBN978 0 580 84456 0
PublisherBSI
Pages22

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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