This is an interesting topic to me. My oldest scored within a few points on his FSIQ over a period of 8 years on WISC IV. The last test was a few points lower at 14 years old. It certainly didn't appear to impact him. Another one of mine hit ceilings all through the test a little over a year ago, but the achievement scores matched the IQ. I'm not to worried about inflation on that testing. Absent any 2E issues, Do you think the more obvious sign of this would be really mismatched Achievement scores or day to day performance for a child? My youngest will likely be tested on WISC-V by the time we test for GT program.