There are many studies that show how SOI can make a difference. Perhaps the most dramatic was done at the University Heights School in Seattle, Washington. In that program, students were seriously behind. Some were LD,LLD,ED, and Dyslexic, yet they gained an average of 14.7 IQ points (as measured by the WISC-R) and showed a language gain of 2.6 stanines. In the second year, the students made an average gain of an additional 11IQ points. Thus, over the two years, the students made an average gain of 25 IQ points, compared with the usual LD programs in which students typically lose about 5 IQ points and make no appreciable gain in language performance.