Welsh government's school banding explained
18 December 2012 Last updated at 07:21 GMT
Secondary schools across Wales will learn later which of five performance bands they have been placed by the Welsh government.
Teaching unions have been critical of the system, but the government says the whole process is about identifying which schools need support and not about naming and shaming.
Education correspondent Nicola Smith explains more to Bethan Rhys Roberts on BBC Radio Wales.