I agree with your premise (that it's impossible to expect a teacher to individualize education for 30 students) but disagree with your proposed solution (technology). The real solution is the CHANGE THE SYSTEM. 30 kids to one teacher is a horrible system. 20 kids to one teacher is a very bad system. 10 kids to one teacher is BARELY workable. That's if we care about children getting a good education. Clearly, we don't.