ISO/TR 8550-3:2007提供了批量供应的产品验收抽样指南，这些产品可被归类为由离散物品（即产品的离散物品）组成。一个批次中的每个项目都可以识别，并与该批次中的其他项目分开，并且有同等的机会被纳入样本。产品的每一项都是可计数的，并且具有特定的特征，这些特征可以在连续的尺度上测量。每个特征至少有一个很好的近似值，一个正态分布或一个可以变换的分布，使其与正态分布非常相似。 变量抽样验收标准适用于各种检验情况。这些包括但不限于以下内容:终产品，如完整产品或子组件；零部件和原材料；服务；在制材料；库存物资；维护操作； 数据或记录；行政程序。 尽管ISO/TR 8550-3:2007主要是从制造和生产的角度编写的，但它应该被自由地解释为适用于ISO 9000中定义的所有类型的产品和过程的取样系统、方案和计划的选择。

ISO/TR 8550-3:2007 provides guidance for acceptance sampling of products that are supplied in lots and that can be classified as consisting of discrete items (i.e. discrete articles of product). Each item in a lot can be identified and segregated from the other items in the lot and has an equal chance of being included in the sample. Each item of product is countable and has specific characteristics that are measurable on a continuous scale. Each characteristic has, at least to a good approximation, a normal distribution or a distribution that can be transformed so that it closely resembles a normal distribution. Standards on acceptance sampling by variables are applicable to a wide variety of inspection situations. These include, but are not limited to, the following: end items, such as complete products or sub-assemblies; components and raw materials; services; materials in process; supplies in storage; maintenance operations; data or records; administrative procedures. Although ISO/TR 8550-3:2007 is written principally in terms of manufacture and production, it should be interpreted liberally as it is applicable to the selection of sampling systems, schemes and plans for all types of product and processes as defined in ISO 9000.