To prevent the spread of COVID-19 in 2020, university faculty members were inevitably required to teach online classes. After many classes have returned to face-to-face learning, if faculty can gain the effectiveness of online classes, they may continue to use online lectures and use the information and communication technology (ICT) tools. Therefore, this study aimed to clarify the factors that enhance the effectiveness of online classes. Specifically, based on a questionnaire survey of university faculty conducted from July to August 2020, we found that the following three factors, “teaching strategies,” “understanding student statuses,” and “promoting student activities,” constitute the efficacy of online classes. Furthermore, to verify the effects of “social support from colleagues, acquaintances, and on-campus support organizations”; “engagement of students”; and “ICT usage in classes,” a hierarchy multi-target regression analysis was performed. Results indicate that the “attendance attitude of students” contributes to the improvement of the effectiveness of online classes, regardless of the class style.
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