A Project Initiation Document supports project success by providing a clear roadmap from the outset. It helps teams understand what success looks like and how it will be measured.

By defining scope and constraints early, the PID reduces the risk of scope creep. Teams can refer back to the document when new requests arise and assess whether they align with the approved objectives.
The PID also improves communication. With a single reference document, stakeholders can stay informed and aligned, reducing misunderstandings and delays.