text: The facial action coding system is a software used in computers that dectects a persons feelings. this software can dectect the feeling of sadness, anger, fear, happiness, surprise, and disgust. In " Making Mona Lisa Smile" the author gives example of how this software dectects ones emotion. It states, " your frontails pars lateralis muscle (above your eyes) raises your eyebrows when you're surpried; your orbicularis oris ( around your mouth) tightens your lips to show anger." Behavior analysis is a big part of what is software does and it's something we do everydayto tell when a friend is sad or angery.