Accountability, autonomy and choice are now the watchwords of education reformers around the globe. This book presents new evidence from the Programme for International Student Assessment (PISA) test on whether students perform better in school systems with such institutional measures in place. It also provides a theoretical framework for considering these reforms and summarizes previous international evidence. The results confirm that various policies promoting accountability, autonomy and choice are strongly associated with higher achievement for students from both disadvantaged and advantaged backgrounds. In particular, choice through public funding for private schools is associated with both higher performance overall and higher equality of opportunity.