Multi-site randomized controlled trials (RCTs) provide unbiased estimates of the average impact in the study sample. However, their ability to accurately predict the impact for individual sites outside the study sample, to inform local policy decisions, is largely unknown. To extend prior research on this question, we analyzed six multi-site RCTs…

The PISA project has steadily increased its influence on the educational discourse and educational policies in the now 70 participating countries. The educational debate has become global, and the race to improve PISA-rankings has become high priority in many countries. For governments the PISA-test is a high-stake test. Governments are blamed for…