Gifted Issues Discussion homepage Forums Recommended Resources Carnegie Learning

Wondering if anyone is or has used this for math? It was created by Carnegie-Mellon University. My DS has been using ALEKs for the past 6 months and the speed with which he moves through it makes me wonder if he's actually learning anything. So I went looking for something more comprehensive and came across this. One thing that I like is that although it is software based, it comes with a text and workbook as well. This would be good for DS as he would be forced to show his work.