Interesting study - thanks for posting.
Any BTDT opinions here? At what age did your kids switch their focus to primarily keyboarding skills?
My son started keyboarding in third/fourth grade. He is now in 7th, and this is the first year he hasn't used a computer in the class. He doesn't take notes - uses the teacher's set - but writes out all his homework and class work. Output is still dramatically diminished when it comes to essays, etc., but he is working faster and hasn't needed the reduced workload accommodation thus far.
