ISO 18391:2016定义了建立和指示总体规格的规则，这些规则用于指定总体特征的条件，这些特征是从工件总体的每个工件上获得的一组特征值建立的。 总体规格（适用于被视为集合而非单个项目的工件总体）可被视为单个规格（适用于被视为单个项目的每个工件）的补充要求。总体规格表示工件总体上使用的统计假设。 注1:总体规范是对单个GPS规范的补充。 注2:ISO 18391:2016无意规定给定的公差方法或如何计算公差值。其目的是指定允许表达总体规格的工具。

ISO 18391:2016 defines rules to establish and to indicate population specifications, which are used to specify conditions on population characteristics, which are established from a set of characteristic values obtained one on each workpiece of a population of workpieces. A population specification (as applied to a population of workpieces considered as a collection and not as individual items) can be seen as a complementary requirement to the individual specification (as applied to each workpiece considered as individual items). Population specifications express the statistical hypotheses used on the population of workpieces. NOTE 1 A population specification is a complement to an individual GPS specification. NOTE 2 ISO 18391:2016 is not intended to mandate a given tolerancing method or how to calculate tolerance values. Its intent is to specify tools to allow the expression of population specifications.