1. An expert system for providing to a user one or more suggested treatments for a patient with physical trauma, comprising: a computing device having a memory; a plurality of data bases in the memory including graphical illustrations of different types of physical trauma, and a knowledge base having rules for relating trauma and patient characteristics to treatments for said different types of physical trauma; an application program, for execution in the computing device, for interactively displaying a series of screens including at least some of the graphical illustrations, to thereby elicit responses from the user concerning the specific type of physical trauma and specific characteristics of the patient, to thereby produce a further data base containing said trauma and patient characteristics; and an inference engine program, for execution in the computing device, for use with said rules and said further data base, for selecting the one or more suggested treatments by stepping through a forward chaining sequence of rules relating to a particular treatment, and then by stepping through a backward chaining sequence of rules, the reverse of the forward chainin sequence, in which said rules are tested, based on said trauma and patient characteristics, to determine the desirability of said particular treatment; the application program presenting the suggested treatments to the user after execution of the inference program.