text: The software to detect the emotions of students would be too expensive and that makes the Facial Action Coding System not valuable. "Your home PC can't handle the complex algorithms used to decode Mona Lisa's smile (Nick D'Alto)." Most schools have standard home computers in class, which means the school will spend a fortune to replace the old computers with new and more powerful computers. After replacing the computers schools will still have to buy the Facial Action Coding System, which will most like cost alot of money that could be used for other things.