[lern_too_spel]

> I’d say the bigger factor, and luckily one that scales well, is teaching the right thing to the student at that moment.

I agree that this is a bigger factor for most in the current environment. I'd argue that this is already a solved problem though with Khan Academy for free. The benefit from 1-on-1 tutoring beyond that has little to do with understanding what the student knows and teaching what's next because that problem is already solved to a degree that is almost indistinguishable from what a skilled tutor can provide. The benefit comes mainly from the tutor being able to figure out why the student answered a question wrong and directly addressing it, speeding up deep understanding.

[travisjungroth]

I disagree that teaching what’s next for the student is a solved problem. Usually the resolution is too coarse and the speed is barely variable at all.