Over deze norm
Is applicable to all types of libraries in all countries. Limitations on the applicability of individual performance indicators are listed in the scope clause of the description of each indicator. Indicators may be used for comparison over time within the same library. Comparisons between libraries may also be made, but only with extreme caution, taking into account any differences in the constituencies of the libraries, with good understanding of the indicators used, and careful interpretation of the data. Does not include indicators for the evaluation of the impact of libraries either on individuals or on society.