Donald D. Hammill, Ed.D.
The DTVP-3 is unique in that its scores are reliable at the .80 level or above for all subtests and .90 or above fore the composites for all age groups. The assessment scores are validated by many studies and features norms based on a large (N = 1,035) representative sample. The DTVP-3 yields scores for both visual perception (No motor response) and visual-motor integration ability and it is shown to be unbiased relative to race, gender, and handedness