The Diagnostic Profiler / Diagnostician is an advanced model-based diagnostic reasoning tool set consisting of a development tool (Diagnostic Profiler) and a dynamic run-time expert system (Diagnostician). Run-time refers to a reasoning engine that is deployed with a system to continuously monitor data and determine the status of the system and the location of faults. The run-time  Diagnostician’s dynamic reasoning capability sets it apart from other tools. 

The Diagnostician reads test / performance monitoring data and provides a diagnostic call-out.  It does this by correlating the data to a diagnostic model of the system or equipment that is derived from design data. The diagnostic model is developed using the Diagnostic Profiler. In development, the user identifies what tests will be available in run-time along with the coverage of those tests. Use of the Diagnostician simplifies test programming or IETM authoring because all of the diagnostic logic which is normally hard-coded as If...Then and Go-To branching logic is contained in the diagnostic knowledge base.  It's a straightforward process, and provides a comprehensive fault isolation capability without coding diagnostic logic and flow charts.