Experimental Design
There are five treatments in our study: Progress Reward System, Regression Punishment System, Top-Performers Reward System, Bottom-Performers Reward System, Non-Reward-and-Punishment System (control).
Under a given treatment, teachers will receives performance reports. Performance reports detail the two types of performance gaps (historical and social). Regarding historical performance gap, current performance may be higher than or lower than past performance. Regarding social performance gap, current performance may be higher than or lower than average performance. Then, teachers need to assess the performance and make decisions.