text: Let me tell you how it works, the process begins when the computer constructs a 3-D computer model of the face. All and every 44 major muscles in the model must move like human muscles. The movement of one or more muscles is called an "action unit." The Facial Action Coding will really help you identify your own emotions, family, and friends. But some people will start thinking about the Facial Action Coding will malfunction on them and they won't be able to identify their emotions.