ISO 8588:2017 官能分析  —  方法論  —  「A」-「notA」テスト | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 12, Sensory analysis.

This second edition cancels and replaces the first edition (ISO 8588:1987), which has been technically revised. The following changes have been made:

• more detailed explanations of all aspects of the test method have been added;
• the option of testing more than one “not A” sample in a single test has been added;
• statistical calculations are presented in detail for all examples;
• an alternative data analysis procedure that deals directly with the one-sided nature of the “A” – “not A” test has been added.

1 Scope

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:

• a) 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);
• b) 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);
• c) 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.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

For the purpose of this document, the terms and definitions given in ISO 5492, for terms concerning sensory analysis, and ISO 3534-1, for statistical terms, apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

Bibliography