The past thirty years have seen a rapid expansion of testing, exposing students worldwide to tests that are now, more than ever, standardized and linked to high-stakes outcomes. The use of testing as a policy tool has been legitimized within international educational development to measure education quality in the vast majority of countries…

Although literacy achievement has improved in Chile, adolescents' underperformance in reading comprehension is still a serious concern. In English, core academic-language skills (CALS) have been found to significantly predict reading comprehension, even controlling for academic vocabulary knowledge. CALS are high-utility language skills that…

As hours per day are inherently a limited resource, increasing daily instruction time reduces the amount of time pupils can dedicate to other activities outside school. We study how the effect of longer school days on achievement varies across students and schools. We exploit a large-scale reform of school schedules that substantially increased…