Abstract: The present invention relates to a real-time hierarchical process control system. The system comprises a multiple-level architecture, each level including a monitor for receiving and monitoring a plurality of input signals. The monitor produces a first request if at least one input signal exceeds a predetermined range. A guardian receives the first request, issues a second request and determines a course of action to take. A consultant receives the second request, performs an analysis and produces information for aiding the determination of a course of action.