Looks like he might have not understood the directions, or not been interested, if he did well on all the other subtests. I would imagine this subtest could be highly affected by vision challenges or fine motor control issues.
Ditto!
If you haven't received any feedback from the person who administered the test, I'd ask for their input - their observations during testing might give you a clue re whether or not it was an attention issue or possibly something fine-motor or vision related. You can also think through whether or not you've noticed any signs of potential issues with either fine motor control or vision, although for some of our 2e kids, those issues don't become apparent until they are a few years older and into a few years of elementary school. I'd also ask the tester what order the subtests were given in to see if cancellation was one of the last out of a long set of subtests or if it was right before lunch etc - times your ds might be tired, hungry or distracted.
In the meantime, if you don't see anything outside of this one test that is a concern re either fine motor or vision issues, I wouldn't worry about it too much at all at this point in time. It could be as simple as he was working slowly to be careful to not miss anything - cancellation is a timed test, and most of the other subtests are not timed.
Best wishes,
polarbear
