My son's block design score was very low....he has dyspraxia so we were expecting to see some possible issues arise and they did....the block design number pulled his overall down. With Dyspraxia it affects fine motor coordination so he had trouble getting his fingers to do what his brain was telling him to do with the blocks. We knew the test score wasn't accurate and the tester told us as well...we retested with another test that didn't need the child to use fine motor skills...and we finally got an accurate look at DS7 :-)