1: LO (lagere school, LAVO, VGLO)
2: LBO (LBO, LTS, ITO, LEAO, Huishoudschool, LLO)
3: MAO (MAVO, IVO, MULO, ULO, 3jr HBS, 3jr VWO, 3jr VHMO)
4: MBO (MTS, UTS, MEAO)
5: HAO (HAVO, VWO, Atheneum, Gymnasium, NMS, HBS, Lyceum)
6: HBO (HTS, HEAO, Wetensch. kand., Univers. onderwijs kand.)
7: WO (Universitair onderwijs, Doctoraalopleiding, TH)