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The paper presents an analysis of a one-semester technical course ldquoElectrical facilitiesrdquo. The goal of the paper is to show how a system of real-time knowledge testing at undergraduate level, using a radio-frequency clicker system and conventional knowledge assessment methods, was implemented on a single course at the University of Zagreb. Using statistical analysis, students are clustered in groups to show the influence of clickers on the student population. It is shown that clickers have a favorable impact on students and work in accordance with each studentpsilas abilities, as confirmed using conventional assessment methods.