The gold standard in making causal inference on program effects is a randomized trial. Most randomization designs in education randomize classrooms or schools rather than individual students. Such "clustered randomization" designs have one principal drawback: They tend to have limited statistical power or precision. This study aims to…

The teacher's task of assigning letter grades to students and the public's interpretation of them can be perplexing. Does the student's grade represent the level of achievement, the gain in achievement, or some combination of the two? Is the student's effort included in the grade, or are high achievers given good marks regardless of effort? Are…