1.1 本试验方法描述了比较两种产品的程序。 1.2 该测试方法没有描述该测试的瑟斯顿建模方法。 1.3 这种测试方法有时被称为简单差异测试。 1.4 同一个不同的测试确定两种产品总体上是相同还是不同。 1.5 本试验方法中所述的试验程序包括向每位评估员提供一对样品。多对的表示需要不同的统计处理，不在本测试方法的范围内。 1.6 与方向差测试不同，该测试方法不是属性特定的。 1.7 本试验方法的目的不是确定差异的大小；然而，可以使用统计方法来估计差异的大小。 1.8 这种测试方法可以在三角测试或二人三人测试中选择，其中感觉疲劳或遗留问题是一个问题，或者需要更简单的任务。 1.9 本标准可能涉及危险材料、操作和设备。本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户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。 1.10 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 当测试目标是确定两个样本之间是否存在感官差异时，使用整体差异测试方法。它也称为简单差分测试。 5.2 该测试适用于样品强度极高、感觉疲劳迅速、味道持久、无法大量食用或两者结合的情况。 5.3 该测试也适用于刺激部位仅限于两个的情况（例如，两只手，脸的每一侧，两只耳朵）。 5.4 该测试提供了一种偏差测量方法，其中法官认为两个相同的产品是不同的。 5.5 该测试具有简单直观的优点。

1.1 This test method describes a procedure for comparing two products. 1.2 This test method does not describe the Thurstonian modeling approach to this test. 1.3 This test method is sometimes referred to as the simple-difference test. 1.4 A same-different test determines whether two products are perceived to be the same or different overall. 1.5 The procedure of the test described in this test method consists of presenting a single pair of samples to each assessor. The presentation of multiple pairs would require different statistical treatment and it is outside of the scope of this test method. 1.6 This test method is not attribute-specific, unlike the directional difference test. 1.7 This test method is not intended to determine the magnitude of the difference; however, statistical methods may be used to estimate the size of the difference. 1.8 This test method may be chosen over the triangle or duo-trio tests where sensory fatigue or carry-over are a concern, or where a simpler task is needed. 1.9 This standard may involve hazardous materials, operations, and equipment. 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. 1.10 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 This overall difference test method is used when the test objective is to determine whether a sensory difference exists or does not exist between two samples. It is also known as the simple difference test. 5.2 The test is appropriate in situations where samples have extreme intensities, give rapid sensory fatigue, have long lingering flavors, or cannot be consumed in large quantities, or a combination thereof. 5.3 The test is also appropriate for situations where the stimulus sites are limited to two (for example, two hands, each side of the face, two ears). 5.4 The test provides a measure of the bias where judges perceive two same products to be different. 5.5 The test has the advantage of being a simple and intuitive task.