What Are the Main Components of the System

The communication link between the human and the technology is a key operational level interface; it is at this level that the human is able to exert control over the machine, or to enter data or receive information from the machine. This means that the devices that support the interaction across this interface will fall into two classes: input and output, synomonous with control and display (at least as far as the human is concerned). If we make the simple assumption that control can be discrete or continuous, then we can begin to determine the sort of information a Person might require to perform such control, and the type of device which would support the control actions.