Issues in OO Technology. Issues in OO Technology.
People regard their environment in terms of objects.
Hence a model whose design is based on objects will result in a small semantic gap between reality and the model. He discusses a case based on a simple industrial control problem that controls the emptying and filling of a tank. The liquid level in the tank is monitored and controlled by inlet and outlet valves which are either open or closed. The inlet valve is always controlled by the system whereas the outlet valve may also be operated manually. The system displays the maximum permissible fill level and the desired level.