This document provides an overview of a presentation on using a "back-casting" approach to gather requirements for implementing Primavera Unifier. The presentation recommends (1) mapping out stakeholders and their needs, (2) creating a forward flow chart of current processes to identify pain points, and (3) working backwards through the flow chart to uncover additional requirements and benefits. Examples of using swimlane diagrams and questioning between steps are provided. The goal is to thoroughly understand requirements to ensure project success and adoption of the new system.