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Background: Due to the global COVID-19 pandemic, online learning became the only way to learn during this unprecedented crisis. This study began with a simple but vital question: What factors influenced the success of online learning during the COVID-19 pandemic with a focus on online learning self-efficacy? Objectives: The purpose of this study was to examine the structural relationship among self-efficacy (SE) in time management, SE in technology use, SE in an online learning environment, and learning engagement. Methods: The participants of the study were 1205 undergraduates who were enrolled in a residential undergraduate program in South Korea in spring semester, 2020. The online survey was administered to collect data for this research and the survey results were analyzed using structural equation modeling. Results and Conclusions: SE in technology use had a significant but negative influence on learning engagement and had a positive impact on SE in an online learning environment. SE in time management had a significant positive impact on SE in an online learning environment and learning engagement. SE in an online learning environment also significantly influenced learning engagement. Implications: SE in technology use itself did not enhance learning engagement. In addition, indirect effects of SE in technology use and SE in time management on learning engagement through SE in an online learning environment were confirmed in this study. This indicates the influential role of SE in an online learning environment on learning engagement of online learners.

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The significance of scaffolding in education has received considerable attention. Many studies have examined the effects of scaffolding with diverse groups of participants, purposes, learning outcomes, and learning environments. The purpose of this research was to conduct a meta-analysis of the effects of scaffolding on learning outcomes in an online learning environment in higher education. This meta-analysis included studies with 64 effect sizes from 18 journal articles published in English, in eight countries, from 2010 to 2019. The meta-analysis revealed that scaffolding in an online learning environment has a large and statistically significant effect on learning outcomes. The meta-cognitive domain yielded a larger effect size than did the affective and cognitive domains. In terms of types of scaffolding activities, meta-cognitive scaffolding outnumbered other types of scaffolding. Computers as a scaffolding source in an online learning environment were also more prevalent than were human instructors. In addition, scholars in the United States have produced a large portion of the scaffolding research. Finally, the academic area of language and literature has adopted scaffolding most widely. Given that effective scaffolding can improve the quality of learning in an online environment, the current research is expected to contribute to online learning outcomes and learning experiences.

Flipped learning recently gained attention as an effective instructional approach to enhance learning engagement, causing many universities to implement it. To enhance student engagement in large university classes, this study examined the effects of self-efficacy, self-regulation and social presence on learning engagement in a large university class using a flipped learning approach. A total of 390 undergraduates who were enrolled in a large general education class using flipped learning at a university in Korea participated in this study. The learners completed an online survey measuring the variables of this study. The research findings indicated that self-regulation affected social presence as well as learning engagement. Self-efficacy affected social presence and indirectly affected learning engagement through social presence. Finally, social presence affected learning engagement. Social presence also mediated the relationship between self-efficacy and learning engagement as well as between self-regulation and learning engagement. This study confirmed the significant effects of self-regulation and social presence on students' learning engagement in large university classes.