Engaging Teachers with Technology Increased Achievement, Bypassing Teachers Did Not
在巴基斯坦中学的两项随机试验中，将专家设计的课程视频融入课堂提高了教学效果，学生数学和科学成绩提升0.3个标准差；而将相同内容直接给学生使用则使成绩下降0.4个标准差，凸显了教师参与的重要性。
Using two RCTs in middle schools in Pakistan, we show that brief, expert-led, curriculum-based videos integrated into the classroom experience improved teaching effectiveness: student test scores in math and science increased by 0.3 standard deviations, 60 percent more than the control group, after 4 months of exposure. Students and teachers increased their attendance, and students were more likely to pass the high-stakes government exams. By contrast, providing similar content to students on personal tablets decreased student scores by 0.4 SD. The contrast between the two effects shows the importance of engaging teachers and the potential for technology to do so.