The Dutch Inspectorate of Education is one of the oldest (since 1801) state Inspectorates of education. Nowadays it uses a system of risk-based inspections to decide which schools should be inspected and which schools can be trusted to deliver good quality education. Every year the Inspectorate collects information on possible risks in all schools. The results of the risk analysis indicate whether a school needs to be investigated more extensively, or whether the school can be trusted to perform adequately during the next year. The Inspectorate publishes the outcome of the risk analyses, and of all further investigations that take place when risks have been detected in a school. In case a school performs inadequately, the Inspectorate states which shortcomings should be improved and subsequently monitors these improvements.  

All details are given in the following link and in the sources given there.  

The Netherlands Profile, published 07 January 2009 (pdf 226kb)