Operator model-based design evaluation of advanced systems: conceptual models

A multilevel operator modeling approach is recommended to provide broad support for the integrated design of advanced control and protection systems for nuclear power plants. Preliminary design should address the symbiosis of automated systems and human operators by giving careful attention to the roles assigned to these two system elements. A conceptual model of the operator role is developed in the context of a command-control-communication problem. According to this approach, joint responsibility can be realized in at least two ways: sharing or allocation. The inherent stabilities of different regions of the operator role space are considered. It is conjectured that the ´supervisor´ role may prove to be less effective than an ´equal partner´ role, because the latter maximizes the degree of engagement for the operator.<>