Extending training to develop more specialised subject content knowledge will also be necessary as outlined above. It runs 17 schools in low- to middle-income neighbourhoods in Santiago. Endowed with a similar level of resources as other private subsidised schools, SIP schools achieve systematically higher SIMCE test scores, with much lower variance, and this is robust to controlling for socio-economic background. In fact, SIP schools’ performance is close to that of private fee-based schools, which serve high-income students with much larger resources as a result of their high fees. There is a selection process for entry based on parent interviews, although not ability tests. A centralised pedagogical department develops tests for all SIP schools to systematically evaluate pupils’ progress.