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Purpose/Thesis: Many countries increasingly use bibliographic databases while devising new scientific policies to analyze and diagnose the state of a scientific discipline. Previous studies on the suitability of data from Web of Science and Scopus databases for this purpose gave ambiguous results. Their authors did not always account for an important issue – the quality of data from these databases. The aim of the article is to analyze the quality of data downloaded in an automated manner from the resources of the mentioned databases. Approach/Methods: The author used a qualitative method of data verification which consisted of automatic acquisition of data about journals from the Web of Science and Scopus databases, and then in their qualitative analysis. The analysis consisted of a comparison of data on journals representing of library and information science (LIS) retrieved from both databases and of the comparison between the qualitative data taken from the studied databases and the data from other, domain focused bibliographic databases; of comparing the acquired data with the information available on the websites of indexed journals and of the comparison of the method used by the producers of the abovementioned databases used to classify the journals as related of LIS, with the thematic scope of the discipline, as agreed upon by scholars. Results and conclusions: It was found that in the case of the examined discipline, automated data acquiring poses a risk of obtaining a low credibility set of data. Most problems are caused by the incompleteness of data and errors in disciplinary classifying journals, articles and authors. Originality/Value: It was shown that, contrary to the claims of the decision-makers of Polish science, in its present form, the studied bibliographic databases have only negligible usefulness for monitoring the state and development tendencies of LIS. Methodological problems created by both databases, presented in this article, may also have an impact on generating a reliable and objective picture of other scientific disciplines. The changes in the sphere of the functioning of WoS and Scopus, apparent for several years, have not dealt with the already existing problems and inconveniences.

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The Usefulness of Data from Web of Science and Scopus Databases for Analyzing the State of a Scientific Discipline. The Case of Library and Information Science