I have rushed reading through this thread as I am supposed to be packing lunches, but I just wanted to chime in before I forget, that for both of my kids Picture Completion, which is like "What's Missing" and the other cartoon based tests on the Wechsler tests were their weakest areas, but both tested very high on the Raven's. I have no idea why this is and have yet to find someone to ask who can give me a good answer. Maybe it's a visual processing thing, maybe it's the nature of the cartoons... But I suspect that those subtests of their WISC/WPPSI scores were not very accurate for my girls, for what what they are supposed to be testing. But of course they might be.