Just found out the ceiling issues for WPPSI,
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The most common wisdom is, on the Wechsler tests (WPPSI, WISC or WAIS), a ceiling is a score of 17-19 on a subtest, and the whole test may be an underestimate if 2 or more subtest ceilings are reached.

Checked DD5's WPPSI report, among all 10 subtests, she got 7 hit the ceilings (18, 19 for Block Design, Matrix Reasoning, picture Concepts, Information, Vocabulary, Word Reasoning, coding), and the rest 3 are almost the ceiling, (16, Receptive Vocab, picture naming, symbol search).

Any suggestions on this ceiling issues, does it mean other tests may be better to handle this? Then, which one is more reliable, can show more clear picture? Her current score 150, >99.9 Percentile on both Performance Scale I.Q. and Full Scale are qualified for for YS Application though.

But, just want to learn from other parents who meet the same issues, have you tried to compare with other tests?

If 7 subtests hit the ceiling, how much she could be improved if she took other test instead without ceiling issue?

BTW, she took WJ-III Ach test along with WPPSI, and got:
157, > 99.9% on Broad Reading
165, > 99.9% on Broad Math
167, > 99.9% on Math Calc Skills

Is there ceiling issues on WJ-III Achievement test too.

Will SB-5 do better than WISC for kids who is extremely strong at Logic, Reasoning, Math, Design, Blocks?

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From Hoagies, it says, All achievement and intelligence tests have ceilings, highest possible scores. Most tests have subtests, and each subtest has a ceiling, sometimes the same as the other subtests, sometimes different, and these subtest ceilings contribute to lowering the overall test score if a child is not evenly or "globally" gifted. And some tests, though they have fairly high ceilings, were not designed to test all the way up to those ceilings - they are only there for subtest head room for the lower scores. For example, the Wechsler intelligence tests were not designed to differentiate scores above 130 (see GT-World's FAQ on The Wechsler Intelligence Scale for Children (WISC) for a quote from Dr. Wechsler).

So how do you know if your child has reached a ceiling on a test? The most common wisdom is, on the Wechsler tests (WPPSI, WISC or WAIS), a ceiling is a score of 17-19 on a subtest, and the whole test may be an underestimate if 2 or more subtest ceilings are reached.

But often, parents are told that the child didn't hit a ceiling, because she didn't answer all the questions correctly, or he didn't get to the hardest questions the test had to offer. Are these not ceilings? There are two ways to identify a ceiling. First, if the child answered any more questions correctly, could she score any higher on the subtest? If the answer is no, she could not score any higher, then it is a ceiling. Second, was the termination criteria for the subtest reached? Tests have specific requirements for stopping a subtest. Commonly, the student must get less than x questions correct of the last y questions asked. If the child did not reach the termination criteria, he hit the ceiling. Either one of these identify a test ceiling.

The next logical question is, even if my child hit the ceiling on two or three (or more) subtests, but that can't mean she hit the ceiling on the whole test, can it? Well... what it does mean is that you don't know. Ceilings are just that - you don't know how tall the building is, how many more floors it might have - once you hit the ceiling. You're just staring at the ceiling. Is it the inside of the roof? Or is there one more floor, or ten more floors? You don't know.