text: One reason why It is not a vaulable resource is it only programed to read six basic human emotions which are Happieness, surprise, anger, disgust, fear and sadness. The human body has way more than just six emotions so getting a high accuracy reading on how you are really feeling is out of the question because FACS uses the a process of a 3-D model Dr. Huang states "The process begins when the computer constructs a 3-D model of the face; all 44 major muscles in the model must move like human muscles." This quote explains that it has to use a way of making a model which can sometimes take some time depending on the processing power of the computer not only that but human emotions can change quite quickly and if the pc doesnt make the model fast enough the computer can easly fail at getting and accuarate reading.