1.1 本试验方法包括确定两种产品样品之间是否存在可感知的感官差异或估计可感知差异大小的程序。 1.2 该测试方法适用于单个感官属性或多个感官属性是否存在差异。 1.3 当样品之间的差异性质未知时，此测试方法适用。造成差异的属性尚未确定。 1.4 四分法在统计学上比三角法更有效（试验方法 E1885 )或二人三组测试（测试方法 E2610 ). 1.5 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 该测试方法对以下测试目标有效: 5.1.1 例如，当成分、加工、包装、处理或储存发生变化时，确定是产生了可感知的差异还是没有产生可感知的区别；或 5.1.2 选择、培训和监控评估员。 5.2 测试方法本身不会改变测试的目的是否是确定产品明显不同，而不是产品足够相似，可以互换使用。 仅选择α、β和δ的值或 P d 改变如果测试的目的是确定两种产品之间是否存在可察觉的差异，那么最初假设这些产品是不可区分的（例如，H O :δ或 P d =0）并且检查数据以确定是否可以拒绝该假设（即得出产品在感知上不同的结论）。如果目标是确定这两种产品是否足够相似，可以互换使用，那么最初假设产品有意义的不同（例如，H O :δ或 P d >选择的值表示有意义的差异）和数据进行检查，以确定是否可以拒绝该假设（即，得出样本足够相似，可以互换使用的结论）。 5.3 四分法包括对四个样本的评估。当被测试的产品导致过度的感官疲劳、遗留或适应时，可能首选涉及较少样本评估的方法（相同-不同，三角形测试等）。

1.1 This test method covers a procedure for determining whether a perceptible sensory difference exists between samples of two products or to estimate the magnitude of the perceptible difference. 1.2 This test method applies whether a difference may exist in a single sensory attribute or in several. 1.3 This test method is applicable when the nature of the difference between the samples is unknown. The attribute(s) responsible for the difference are not identified. 1.4 The tetrad test is more efficient statistically than the triangle test (Test Method E1885 ) or the duo-trio test (Test Method E2610 ). 1.5 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. 1.6 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. ====== Significance And Use ====== 5.1 The test method is effective for the following test objectives: 5.1.1 To determine whether a perceptible difference results or a perceptible difference does not result, for example, when a change is made in ingredients, processing, packaging, handling, or storage; or 5.1.2 To select, train, and monitor assessors. 5.2 The test method itself does not change whether the purpose of the test is to determine that the products are perceptibly different versus that the products are sufficiently similar to be used interchangeably. Only the selected values of α, β, and δ or P d change. If the objective of the test is to determine if there is a perceptible difference between two products, then initially the products are assumed to be indistinguishable (for example, H O : δ or P d = 0) and the data are examined to determine if the assumption can be rejected (that is, conclude that the products are perceptively different). If the objective is to determine if the two products are sufficiently similar to be used interchangeably, then initially the products are assumed to be meaningfully different (for example, H O : δ or P d > the value chosen to represent a meaningful difference) and the data are examined to determine if the assumption can be rejected (that is, conclude that the samples are sufficiently similar to be used interchangeably). 5.3 The tetrad method involves the evaluation of four samples. When the products being tested cause excessive sensory fatigue, carryover, or adaptation, methods that involve the evaluation of fewer samples (same-different, triangle test, etc.) may be preferred.