That's pretty much how we have approached homeschooling so far. There is so much to learn out there and unless the kid is really dying to move faster (and some are- I think that I might have actually finished college if I had been allowed to start at 15), I think deeper is a great way to go. It's not possible in every situation or with every kid, but I think if you can get the right combination of the two, it's a valid alternative to radical acceleration. The only subject we really struggled with was math, because it's such a linear subject and Ds7 is so intuitive once a concept is presented, I felt like we were hurtling forward almost out of control. It was hard for me to step back and look for other ways. But once I did, I saw (thanks to a lot of help from this board) that even with math there are other ways to go than up.