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Viewers' rating of educational online videos provides a clue about content quality and is frequently used as filter in video search and recommendation systems. However, it is unclear what motivates students to give a positive or negative rate to an educational video. In the presented study we tried to find out the reasons behind students' ratings. A total of 51 students were asked to rate a total of 54 YouTube's videos and to write using their own words the reasons for each rating. After cleaning the responses, 1602 and 732 reasoning statements for Like or Dislike ratings were analyzed using group concept mapping, respectively. A sentimental framework could be established consisting of six clusters in this order of significance: explanation, technical presentation, content, voice and language, efficiency, and interestingness. Toward generalizing this framework, we investigated the relationship between the online ratings …