The Face Interface system allows users to select facial gestures to control the Windows interface without a keyboard or mouse. The system recognizes head shaking, nodding, eyes and mouth open/closed, and head position through an avatar, giving users the ability to easily view possibilities and change their approaches. Attention Meter demonstrated the ability to rapidly program interfaces for using these features in a variety of environments, including C++, Flash, and Max-MSP. This previous work taught us the usefulness of the face as an input in human-computer interaction, and using this knowledge, Face Interface can inform and critique the user's design choices. This is an exemplar for a new input approach that allows users to define their interactions without programming and to experience and learn the design parameters of a new and unfamiliar system.