ISO/TR 28118:2009确立了国家图书馆的绩效指标。它也适用于有区域任务但没有明确服务对象的图书馆，因为它们的许多评估问题与国家图书馆的评估问题相对应。 性能指标对于同一库中的时间比较特别重要。如果考虑到图书馆的任务和功能的差异，图书馆之间的比较是可能的。 ISO/TR 28118:2009不包括用于评估图书馆服务对个人、图书馆服务的社区或社会的结果或影响的绩效指标。 由于这是图书馆绩效衡量的一个不断发展的领域，可以在以后添加此类绩效指标。 ISO/TR 28118:2009不排除使用本文未规定的任何性能指标。

ISO/TR 28118:2009 establishes the performance indicators for national libraries. It is also applicable to libraries with regional tasks and without a defined population to be served, as many of their evaluation problems correspond to those of national libraries. The performance indicators are of special interest for comparison over time within the same library. Comparisons between libraries are possible, if differences in the tasks and constituencies of the libraries are taken into account. ISO/TR 28118:2009 does not include performance indicators for evaluating the outcomes or impact of library services either on individuals, on the communities that libraries serve, or on society at this time. Since this is an evolving area of performance measurement for libraries, such performance indicators can be added at a later date. ISO/TR 28118:2009 is not intended to exclude the use of any performance indicators which have not been specified herein.