You do have to sit with him, or at least be nearby and helping him. You can't expect a computer program to take the place of you as a teacher/mentor... that goes for everything, forever! That is why so many complain about things like Teaching Textbooks math. People buy it thinking it takes them out of the equation, then their kids fail at math and the parent blames the program when the parent wasn't making sure the student was actually grasping the concepts and not just "playing on the computer".