1. A computer-implemented method of planning and optimizing information technology (IT) infrastructure transformations, the computer implemented method comprising: creating a predictive effort estimation model for transforming an existing IT infrastructure into a transformed IT infrastructure, wherein transforming the existing IT infrastructure comprises replacing legacy applications; emulating an introduction of a new application into the existing IT infrastructure through a use of a decision tree for transformation path determination to create a transformation path emulation; emulating a use of a software factory for introducing the new application into the existing IT infrastructure to create a software factory use emulation for creating the transformed IT infrastructure; accurizing the predictive effort estimation model with results from the transformation path emulation and the software factory use emulation to create an accurized transformed IT infrastructure model; and deploying a physical transformed IT infrastructure using the accurized transformed IT infrastructure model to physically transform the existing IT infrastructure.