This document provides both a methodology and an example scenario to help you run a tool rationalization in your own organization. The methodology provides an easy-to-adopt method for rationalizing your baseline tools, identifying a target tools landscape, creating a roadmap, and executing on the work packages and deliverables using the IT4IT Reference Architecture, a standard of The Open Group. The example provided in this document walks you through how to rationalize tools in Detect to Correct (D2C), one of the four value streams of the IT4IT standard.