Teachers on the Move: Evidence From a Large-Scale Learning Intervention During Lockdown
研究了新冠封锁期间一项大规模辅助教师干预项目，为无法上网的孩子提供学习资源，使测试成绩平均提高1.87个标准差，成本效益极高。
The move to remote learning during Covid-19 school closures left children who had no access to e-learning infrastructure without options to continue their education. In this paper we present evidence from a large-scale para-teacher intervention which brought learning resources to the homes of children cut-off by school closures. Over the 6.5 months of intervention, children enrolled in the intervention saw an average increase in test scores of 1.87 SD, with greater gains for those with lower baseline assessment scores. With these gains achieved at a cost of 5.48-7.39 USD per SD, the intervention was extremely cost effective.