1. A method for self-calibration and refinement of project estimation models for implementing packaged software applications, the method comprising: publishing a resultant project estimation model with related data from an estimation systems to a knowledge repository and to one or more stakeholders, the resultant project estimation model being based on one or more preexisting project estimation models related to different projects and created before the resultant project estimation model is created, the resultant project estimation model having been modified by a user; analyzing the resultant project estimation models with one or more model refiners that are in signal communication with the one or more knowledge repositories, the model refiners comparing the resultant project estimation model to the preexisting project estimation models; and refining one or more of the preexisting 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.