User: hepaminondas

Difficult functionality, research is catching up

On: Computer Activities for Those With Speech and Language Difficulties?

Correcting a human's articulations is a really tough task for a machine.
Interesting research on the topic has already been made, and the most interesting that I've seen lately is coming from KTH, in Sweden.

ARTUR - the ARticulation TUtoR
http://www.speech.kth.se/multimodal/ARTUR/

I guess you could ask them about the availabitilty of their software, but you would need a lot of work to customize it for each of the participants.
Or they could maybe give you an alternative....