Summary.In order to obtain evidence as to the factor structure of Frostig's Developmental Test of Visual Perception, a factor analysis was made of the intercorrelations of subtest scores from the standardisation sample. Four separate principal component analyses were carried out, one for each of the grade levels concerned. It was found that in three out of four cases a single general factor, identified as perceptual maturity, was the only factor of significance. The fourth analysis extracted two factors, the first being the general factor already referred to, and the second a bipolar reflecting differences in the test content. These results are discussed with reference to other factorial studies and to the claims made for the relative orthogonality of the subtests.