1. A method for generating an equivalent circuit model to determine the behavior and frequency performance of a substrate mounted electrical circuit component mounted upon a given substrate, the equivalent circuit model incorporating substrate-dependency parameters, the method comprising the steps of: selecting a substrate mounted electrical circuit component for which an equivalent circuit model is desired; determining equivalent circuit model input parameters, wherein some of which are dependent upon characteristics of the substrate upon which the component is mounted, for the selected component; representing the selected electrical circuit component mounted upon the substrate as an equivalent electrical circuit; formulating mathematical expressions based upon the input parameters; and creating a unique equivalent circuit model for the component mounted upon the given substrate, the unique equivalent circuit model representing the mounting of the component upon the given substrate wherein the equivalent circuit model provides behavior and performance predictions of the component based upon the given substrate characteristics.