The presence of a considerable amount of items with differential functioning can make a test less valid. Therefore, the existence of Differential Item Functioning (DIF) in the intelligence test SON-R 2½-7[a] was investigated. This is the abridged edition of the SON-R 2½-7 with normatization and validation studies realized in various European countries. The data of the Brazilian normatization sample of 1,200 children were used to verify the presence of DIF in relation to gender and region using the IRT method. Of a total of 60 items, 5 items were indicated as having DIF for gender and 13 items as having DIF between regions. It was concluded that the majority of the items were adequate, which makes the use of the test feasible in a national context.
DIF; SON-R 2½-7[a]; intelligence test
