++++ Social security for migrant workers ° Invalidity insurance ° Calculation of benefits ° Special rules for the implementation of the Netherlands legislation relating to insurance against incapacity for work ° Period of paid employment or period treated as such ° Concept ° Employment as a teacher under a contract of employment concluded with a private educational establishment ° Included ° Affiliation, during that period of employment, to a special scheme excluded from the scope of Regulation No 1408/71 ° No effect (EC Treaty, Art. 51; Council Regulation No 1408/71, Art. 46(2) and Point 4(a) of Annex V)