Evaluation is the best tool to learn and understand a system. Ideally, evaluation is incorporated into all the activities and processes of a library and it helps librarians rethink the traditional library principles in a fast - -moving world. There are library standards that give us great help in this process. (ISO 11620: 2014 Information and documentation. Library performance indicators, and ISO 16439: 2018 Information and Documentation: Methods and Procedures for Assessing the Impact of Libraries.). Here, the Electronic Periodical Archives and Database (EPA) was analysed with the above-mentioned guides from the very specific viewpoint of evaluating its services and collection. EPA is edited, developed and operated by the E-Library Services Department of the National Széchényi Library (NSZL). It is an archive management system, equipped with source and location registration system of electronic periodicals, and also a national web site database operated by the NSZL. The main reason I used International Standards for this analysis is that the library standard supports the use of performance indicators regarding the quality of library services in libraries and to spread knowledge about how to conduct performance measurement. It also provides guidance on how to implement performance indicators in libraries where such indicators are not already in use. With these, long-term effects may appear on user satisfaction indicators, on library service policy, and it may also contribute to improved scientific research results for users, and can enhance their competence by providing them with a higher quality level of digital documents. [ABSTRACT FROM AUTHOR]