Mode Error in Supervisory Control of Automated Systems

Abstract

Mode errors are one kind of breakdown in human-computer interaction. The concept was developed originally in the context of relatively simple reactive computerized devices such as word processors. When a device possesses multiple modes, where something is done one way in one mode and another way in another mode, there is increased potential for erroneous actions. In this paper we extend and expand the concept of mode error to supervisory control of automated resources in event-driven situations such as pilot interaction with cockpit automation. In this type of situation, the state of the automated system can change in response to either operator input, situation factors or system factors. This creates complexities in tracking system mode changes over time, surprises created by “uncommanded” mode changes, and the possibility of errors of omission as well as commission in managing multiple system modes. Progress in our understanding of mode error in the context of highly automated systems is important in our ability to develop effective countermeasures for mode-related problems in human-computer cooperation.