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The present article stems from an experimental study related to the evaluation of the usability of tools by a rule-based system. The work suggests a robust computational model that will be able to avoid the main problems arising from the experimental study (a large and less-legible rule base) and to deal with the vagueness of IT user experience, different levels of skills and various numbers of filled questionnaires in different departments. The computational model is based on three hierarchical levels of aggregation supported by fuzzy logic. Choices for the most suitable aggregation functions in each level are advocated and illustrated with examples. The number of questions and granularity of answers in this approach can be adjusted to each user group, which could reduce the response burden and errors. Finally, the paper briefly describes further possibilities of the suggested approach.<\/jats:p>","DOI":"10.2478\/amcs-2019-0036","type":"journal-article","created":{"date-parts":[[2019,10,1]],"date-time":"2019-10-01T02:53:12Z","timestamp":1569898392000},"page":"489-501","source":"Crossref","is-referenced-by-count":3,"title":["A Three\u2013Level Aggregation Model for Evaluating Software Usability by Fuzzy Logic"],"prefix":"10.61822","volume":"29","author":[{"given":"Eva","family":"Rakovsk\u00e1","sequence":"first","affiliation":[{"name":"Faculty of Economic Informatics , University of Economics in Bratislava , Dolnozemsk\u00e1 cesta 1, 852 35 Bratislava , Slovakia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Miroslav","family":"Hudec","sequence":"additional","affiliation":[{"name":"Faculty of Economic Informatics , University of Economics in Bratislava , Dolnozemsk\u00e1 cesta 1, 852 35 Bratislava , Slovakia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"37438","published-online":{"date-parts":[[2019,9,28]]},"reference":[{"key":"2023050302354318283_j_amcs-2019-0036_ref_001_w2aab3b7b5b1b6b1ab1ab1Aa","unstructured":"Albert, W. and Tullis, T. 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