1. An industrial process diagnostic apparatus for identifying a root cause of an aberration in an industrial process, comprising: a plurality of process models, each model related to a physical implementation of an industrial process; a model selection input configured to receive a selected model, the selected model uniquely identifying one of the process models; a process signal input configured to receive a plurality of process signals related to the process; and a root cause output indicative of a source of the aberration in the process, the root cause output a function of the selected model and the process signals.