23. The method according to claim 22 , further comprising generating, by the computer, a lesson comprising a number of learning activities according to an ability threshold associated with the goal.
23. The method according to claim 22 , further comprising generating, by the computer, a lesson comprising a number of learning activities according to an ability threshold associated with the goal. 24. The method according to claim 23 , further comprising generating, by the computer, a unit comprising a number of lessons according to the one or more ability thresholds of the goal.