text: Like I've said before the FACS can modify or help the teachers or lesson to become a more effective lesson to the students. The FACS can detect which muscles are being used in your facial expression and use that detection to make a more effective lesson for the students. The text states," The process begins when the computer constructs a 3-D computer model of the face; all 44 major muscles in the model must move like human muscles. Movement of one or more muscles is called an action unit." The text also states," Eckman has classified six basic emotions-happiness, suprise, anger, disgust, fear, and sadness-and then associated each with characteristic movements of the facial muscles. This explains that the FACS is very productive and is promising.