Analog input device physical characteristics

When selecting a device, a designer should compare alternative devices point-by-point. When making a tentative decision, one needs to know what other possibilities have been locked out. A classification graph does this.New here is this classification graph. Also new are several terms: free, sticky, unbounded, bounded, homogeneous and volatile. We developed this classification of existing devices while building the GRIP-75 interactive molecular computer graphics system 2, 11 and refined the classification during discussions with other system builders where we used this classification to map out alternatives. This paper is founded on practice and experience, not on classification theory.