1. An integrated evaluation and simulation system for a ground combat vehicle, comprising: a computer system programmed to implement a computational engine having a causal network model factoring at least one interrelationship among a plurality of critical combat effectiveness functional attributes and constrained resources for the ground combat vehicle, and to create an optimally combat effective virtual representation of the ground combat vehicle; at least one virtual simulation system operatively coupled to the computational engine for simulating the ground combat vehicle; and a user interface operatively coupled to at least the computer system for selectively inputting data into the computational engine and receiving information from the computational engine and the virtual simulation system.