Our DS, now 12, has done both kinds of summer programs through CTY (day program at 9 and 10 and residential at 11), and loved them all. The residential program made a huge difference for him - aside from the social stuff, which was more apparent and important to him than at the day site, the experience this past summer also really increased his desire to be accelerated. Compared to other summer science programs he has done CTY is so far ahead, they don't even really compare. I hope your DS enjoys it! If you'd like info about the So Cal sites PM me ...