There's much to read on the differences between the two tests. My son did very well on the WISC-IV and WJ-III, along with another verbal IQ test. EG/PG across the board according to these.

With the SB-5 much lower, he would not have made the 130 cut-off for our gifted program. Wild differences. Thankfully the collection of other tests along with his real-life performance showed the higher scores to more accurately reflect his abilities.

I'm heading out the door so won't do much editing with what I've collected.. but it seems that for some, the SB-5 is a totally different "Yardstick."

Hope this helps!

---------------------------------
Here you go... in no particular order. The quotes are all from the linked articles.

http://www.giftedchildren.org.nz/forum/read.php?f=3&i=3125&t=2378
"Comparing the same versions of individual IQ tests, such as the WISC-IV to the SB-5, should be straightforward. But each test has its own strengths. Psychologists suggest that matching the test to the subject's strengths results in the most accurate IQ score. The current version of the Wechsler, the WISC-IV, is a strong test for verbally gifted children, with emphasis on knowledge gained from reading. This version of the WISC, however, is also heavily timed. Short term memory and processing speed scales often lower the full scale IQ score for gifted children. Psychologists should be familiar with the alternate scoring, called the Global Intelligence Index (GAI), in cases where the difference between the verbal scale and short term memory or processing speed scales exceed limits. The current version of the Stanford Binet, the SB-5, is stronger for non-verbal intelligence, and less heavily timed. Note that for the previous versions of these tests, the WISC-III and SB-4, the common wisdom was exactly the opposite: use the WISC-III for non-verbal kids, and the SB-4 for verbal / intelligence gifted kids."

Full text of one study:
Gifted and highly gifted students: how do they score on the SB5?
http://www.thefreelibrary.com/_/print/PrintArticle.aspx?id=150850213

"In contrast to the means on the SBS, which seem to be lower than expected, many of the age-equivalent scores appear to be higher than one might expect. The proportion of children that received age-equivalent scores beyond the highest average score for mature adults (19% of gifted students and 40% of highly gifted students) seems implausible even after taking into account documented cautions in interpreting such scores (Sattler, 2001). If these age-equivalent scores are indicative of actual functioning, it seems curious that they are not accompanied by correspondingly high IQ scores. In sum, these scores appeared to be of minimal use in accurately describing levels of giftedness in our sample."

and

"Another interesting finding is that some individual's scores varied dramatically between the two intelligence tests (as much as 35 points). Two students in the highly gifted program scored so low on the SB5 that they would not meet intelligence test criteria for giftedness even if the cut-off were lowered to 115. Alternatively, several students who scored at the low end of the IQ cut-off for our gifted program did very well on the SB5 and scored within the range of the study completed by Riverside on child prodigies."


This one shows discrepancies specifically for highly verbal kids:
http://www.malonefamilyfoundation.org/whatisgifted_assessing2.html
"Conclusion:
Any test can only measure a small portion of a person's competence. Therefore, all tests underestimate children's abilities rather than overestimate them. It is nearly impossible to fake abstract reasoning at an advanced level. When a disabled child achieves two different IQ scores, the higher score is believed to be the best estimate of the child's potential. Gifted children deserve the same attitude."

Discussions of SB-V at Davidson GT group:
http://giftedissues.davidsongifted.org/BB/ubbthreads.php/topics/55959/1.html

Also WISC-IV v. SB-LM
http://giftedissues.davidsongifted.org/B...res_vs_sta.html

And another:
http://giftedissues.davidsongifted.org/BB/ubbthreads.php/topics/33188/2.html

Being offended is a natural consequence of leaving the house. - Fran Lebowitz