Since 2014, a revise version of digital textbooks on English, Science, Society subjects have
been implementing in 163 elementary and secondary demonstration schools. Given that digital
textbooks would be incorporated in elementary and middle schools across South Korea, it is
necessary to investigate factors that affect learning outcome in the classes where using digital
textbooks. Thus, the aim of the study is to determine structural relationships among digital
textbook self-efficacy, digital textbook quality, and self-directed learning factors affecting
learners’ learning satisfaction. The survey participants were 329 Korean middle school students
who studied using digital textbooks for a science class. Structural equation modeling (SEM)
analysis was conducted in order to examine the causal relationships among the variables. The
results indicated that first, digital textbook self-efficacy and digital textbook quality had
significant effects on self-directed learning. Second, digital textbook self-efficacy and digital
textbook quality showed a significant effect on satisfaction, while self-directed learning did not.
Based on the result of the research, the study suggests strategies that helps to increase students’
ability of self-directed learning and learning satisfaction in classrooms where using digital
textbooks.