text: One thing that would be extremly hard to control would be when kids make weird or strange faces. How will a computer distinguish between an emotion due to the lesson and emotion due to something else. Like when a student is talkling to there friend and they laugh or smile. A student could also try to look bored or confused on purpose just to get out of doing certain work. Another big issue is the fact that not every students facial features are the same. One students face could look way different from the faces that the software the computer was built to recognize.