text: Computers make errors all the time they are no where near perfection. What if the computer does not have the sennsors to pick up expression. It is not like every school or home schooled student is going to go out and buy a computer that can do the same thing a parent or teacher can do. This invention "stores similar anatomical information as electronic code". The Facial Action Coding System is amazing to show expressions in art work, but not for students.