1-2 Managing and Entertaining
The output of a self-regulating system becomes input for a learning system. If the output of the learning system also becomes input for the selfregulating system, two cases arise. The first case is managing automatic systems, for example, a person setting the heading of an autopilot—or the speed of a steam engine. The second variation is a computer running an application, which seeks to maintain a relationship with its user. Often the application’s goal is to keep users engaged, for example, increasing difficulty as player skill increases or introducing surprises as activity falls, provoking renewed activity. This type of interaction is entertaining—maintaining the engagement of a learning system. If 1-2 or 2-1 is open loop, the interaction may be seen as essentially the same as the open-loop case of 0-2, which may be reduced to 0-0.
Source: Dubberly Hugh, Pangaro, Haque. «What is Interaction?
Are There Different Types?». 2009. ACM 1072-5220/09/0100