Evaluation bibliothekarischer Online-Angebote.

From the users' point of view two aspects are essential for the quality of library online services. On the one hand, relevant content must be available. On the other hand, it should be simple and intuitive to find and to access this content. Therefore, the topics usability and usefulness are of great importance for libraries. This article describes how these two aspects can be evaluated and how libraries can use BibEval and PECI for assessments of their own services. [ABSTRACT FROM AUTHOR]