With The Observer® XT it is possible to manage the whole FACS or parts of it, allowing comprehensive coding when needed. There are dozens of muscles in the face. These are represented in the FACS (version 2002) with 44 action units of facial muscles, and 14 action units of muscles in the head (of the eye and neck for instance). Since the activation of one action unit can coexist with as many as ten other units, the coding scheme can become very large: more than seven thousand combinations of action units have been identified . Use The Observer XT to manage such a large coding scheme. Working with The Observer XT will save you valuable time and energy.