Evaluation
Researchers measured the effect of class size, teacher quality, and classroom quality on earnings and other future outcomes for children participating in the Student/Teacher Achievement Ratio (STAR) project in Tennessee. The study found that smaller class sizes raised college attendance, more experienced teachers increased future earnings of their students, and higher quality classrooms improved both college attendance and future earnings. Researchers found that the positive effects of early childhood education on test scores diminish over time, but positive effects on non-cognitive outcomes persist through adulthood.