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An IT project is best characterized by a quantifiable deadline, well-defined deliverables, and cross-collaborative outcomes. A project plan is more of a granular representation of the processes, best used by the project team as an internal resource. A roadmap is a strategic view of the project with approximate timelines, prepared specifically for the stakeholders, top-level leadership, and coordinating with other adjoining teams. Even if the project plans change, due to cost-cutting, budgeting, or any other reason, the roadmap is most likely to remain constant.