August, I'm coming in very late here, just happened to notice this... Yes, it's very rare. I could look it up in the norming tables, but it's very very rare. I would want to know, though, what the kid was actually doing during that subtest, particularly if Symbol Search was in line with the rest of the tests. Sometimes kids are being extremely perfectionistic and sometimes they're being downright not particularly compliant with the task... I would have expected a tester to address that in a report.