本文件定义了国家图书馆质量评估的术语，并规定了以下评估方法: -绩效衡量，以及 -影响评估。 这两种方法的结果在同一个库中随着时间的推移进行比较时特别有意义。如果考虑到各图书馆的任务、任务和服务对象的差异，就可以对各图书馆进行比较。 并非本文件中描述的所有方法都适用于所有国家图书馆。说明中规定了各个方法的适用性限制。 本文件不排除使用性能指标或未在其中规定的影响评估方法。 本文件不涉及网络存档，但参考ISO/TR 14873，了解国家图书馆这项新任务的统计和质量问题。

This document defines terms for the quality assessment of national libraries and specifies the following methods for the assessment: — performance measurement, and — impact assessment. The results of both methods are of special interest for comparison over time within the same library. Comparisons between libraries are possible if differences in the mandate, tasks and constituencies of the libraries are taken into account. Not all methods described in this document apply to all national libraries. Limitations of the applicability of individual methods are specified in the descriptions. This document is not intended to exclude the use of performance indicators or of methods for impact assessment not specified in it. This document does not cover web archiving, but refers to ISO/TR 14873 for statistics and quality issues for this new task of national libraries.