1) Physical variables carrying the information (relative/absolute position, force, velocity, acceleration, etc.);
2) Dimensionality of control (degrees of freedom);
3) Multiplicity of control (number of parallel control variables);
4) Control modality (discrete/continuous);
5) Control monitoring (one-shot or continuous time, holds last value or returns to nominal value, sequential or "skip-out" the continuum output, etc.); 12
6) Control distance function (monotonic, non-monotonic, uni/bipolar, etc.);
7) Literalness of control (mapping);
8) Historical foundations (design context);
9) Design appropriateness (efficiency, ergonomics, etc.);
10) Psychological nature of control (causality, exploratory or goal-oriented
control);