Once the system is stable enough, it is time to review the opportunities for taking the business to the next level. The initial implementation is phase one of the project and you may not see the direct ROI by just going live. Many times, the initial impetus of a new ERP system is risk avoidance of using a non-supported platform. Many business process improvement initiatives would have to be taken up once you have the foundation in place, and these would result in true ROI from the Dynamics AX project.
A PIR is useful for the following reasons: