1. A method for self-calibration and refinement of project estimation models for implementing packaged software applications, the method comprising: publishing one or more resultant project estimation models with related data from one or more estimation systems to one or more knowledge repositories and to one or more stakeholders; analyzing the one or more resultant project estimation models with one or more model refiners that are in signal communication with the one or more knowledge repositories; and wherein the one or more model refiners calibrate by updating, validating, and refining one or more existing project estimation models and their associated parameters stored and provided by the one or more knowledge repositories, based on the one or more model refiner analyses of the resultant project estimation models.