we just got both tests done. I must say I'm so glad that we did. Due to whatever goes on in my son's brain, his WISC scores are ALL over the place despite having an high FSIQ and PG subscore. The WJIII, which measures many areas showed that he is performing 90+percentiles in almost all areas, but what was valuable is seeing where is he IS NOT, so that we can address those areas. Despite not having any "labeled" LD, the two tests in conjunction revealed his "relative weaknesses" which I think will ultimately be very helpful.