School autonomy is popular but also complex and sometimes contentious. Many education systems have increased schools' autonomy in the hope of achieving greater efficiency and closer adaptation to local needs. In some countries, however, increased autonomy has led to greater pressure on schools and local stakeholders. To be successful, school autonomy needs to be built on a set of key ingredients: a strong national framework and a clear strategic vision, well-adapted school head and teacher training programmes, solid accountability mechanisms, and the creation of a collaborative environment -- between and within schools.