This report undertakes a rapid review of some recent, high quality syntheses and reports to summarise the evidence on the effectiveness of different types of non-state schools in reaching the marginalised and providing quality education to them. Non-state provision has risen dramatically over the last few decades especially across South and West Asia and the Latin America and Caribbean region and provides opportunities in Sub-Saharan Africa and elsewhere. The all-encompassing term ‘non-state’ constitutes a spectrum of providers with different characteristics, scope and scale. Overall, the evidence is indicative of potential improvements in learning outcomes in certain types of non-state provision but this is caveated by the very low overall learning outcomes across education systems, as well as by the extent to which non-state provision is aligned with human rights. There is evidence of certain types of non-state providers being able to reach the marginalised and disadvantaged more effectively but questions exist with regards to their sustainability. Whilst different types of arrangements may work in different contexts, the critical factor remains the governments’ ability to both foster an enabling environment but also combine it with effective legislation, monitoring and regulation to ensure quality education provision.