The Program for International Student Assessment (PISA) by the OECD measures student study time during formal school periods and during periods of out-of-school-time (OST). The purpose of these items is to account for differences in country to country achievement levels. However, analyses of the impact of additional study time on student…

Globalisation and rapid technological progress have increased the focus on efficient investment in high-quality skills across the European Union (EU) countries. One issue that is high on the political agenda is the persistent underachievement among youths in many European countries meaning that approximately 20 percent of Europe's 15 year olds…