Zen, I don't know what Davidson would consider 2 grade levels ahead, but as we've tutored our ds (who has a written expression challenge) we've used our school district and state curriculum guidelines to gauge where he is at and what he should be mastering. I found them by searching online - the school district curriculum guidelines are posted on our school district's website and the state curriculum guidelines are posted on our state's department of education website. If you can't find the specifics online, you might try asking your ds' teachers where to look or if they have a copy. The specs our district uses are very specific, so it's relatively easy to see what's expected of one grade vs another and to see what development is expected from grade to grade.
If your ds is challenged by handwriting I'd also suggest you encourage him to "write" by scribing, recording or typing - chances are you might get a much more detailed complex advanced output.
polarbear
