本文件定义了在使用可持续性指标评估建筑物和土木工程的经济、社会和/或环境绩效时，制定和使用基准的原则、要求和指南。 它补充并支持ISO 21929-1和ISO/TS 21929-2的应用，为建立支持目标设定、决策制定和与第三方沟通的基准制定原则和要求。本文件还与ISO 21931-1和ISO 21931-2相关，为建立和使用与环境绩效和可持续性其他方面相关的基准制定了原则、要求和指南。 本文件描述了三种基准值（用于比较的性能水平）: -极限值； -参考值； -目标值。 本文件没有设定基准。

This document defines principles, requirements and guidelines for the development and use of benchmarks when assessing the economic, social and/or environmental performance of buildings and civil engineering works by using sustainability indicators. It complements and supports the application of ISO 21929-1 and ISO/TS 21929-2 by creating principles and requirements for the establishment of benchmarks that support target setting, decision making and communication to third parties. This document is also related to ISO 21931-1 and ISO 21931-2 by creating principles, requirements and guidelines for the establishment and use of benchmarks related to environmental performance and other aspects of sustainability. This document describes three types of values for benchmarks (performance levels for comparison purposes): — limit values; — reference values; — target values. This document does not set benchmarks.