Abstract: A system for and method of pre-filtering data to create and/or maintain data in a working memory such that the data can be more efficiently used by an expert system. In one example, event triggers are used to enable efficient management of faults that occur in an expert system, such as faults that occur in connection with the interaction between a central system and a number of remote systems controlled by the central system. The event triggers filter data that is potentially relevant to the operation of the expert system, each event trigger comprising a match portion and an action portion. A processor compares the match portion of at least one of the event triggers to the potentially relevant data, and executes the action portion of any event trigger whose match portion matches the potentially relevant data, the execution comprising modifying the working memory. The evaluation of and execution of the event triggers occurs independently of other event triggers.