Study limitations
Several limitations of flipped classroom teaching need to be considered. First, flipped classroom teaching may increase the workload for the students, so that some students may be anxious and lost learning motivation due to insufficient pre-class preparation time. The educators should always monitor the learning progress of students and give appropriate guidance to help students keep learning motivation. Second, some evaluations of the flipped classroom strategy are based on group-assessment rather than individual students, so that some students who did not participate in group learning and discussion may even get same scores with their peers. Therefore, an updated evaluation system would be required to assess students’ compliance (i.e., participation, engagement, attendance) during the teaching process [