Warum die Leistungen von Bibliotheken vergleichen?

The still-open question if and how public competition of libraries is possible and makes sense shall be separated from the discussion about the lacking acceptance of the library index. The differentiation between functional and competition-orientated benchmarking recommends for both systems different tools which are methodically improperly connected in BIX. The question whether it is possible at all to generally assess library performance using indices is also critically examined. [ABSTRACT FROM AUTHOR]