This is particularly true in the case of the Agency for Quality Education, which is building up an assessment and feedback mechanism on school effectiveness that should allow schools to make a more effective use of resources. It forbids private-subsidised schools to select their students on the basis of economic, social and academic criteria. This is likely to put an end to a longstanding practice which has been considered one of the reasons for the high level of socio-economic segregation in the Chilean school system.