The Migration Plan describes the migration from existing systems or applications to the new solution. Migration is often more important in infrastructure deployment than application development projects, but application development projects usually will also include some sort of migration. Information on what will be migrated is found in the Functional Specification. The Vision/Scope document may also provide some insight into the overall migration strategy.
Migration is critical to success. Without well-tested migration paths, new solutions can fail because legacy components introduce risks that were never accounted for during planning. If data or functionality from legacy systems cannot be migrated successfully to the new solution, the new solution cannot be deployed and a return on investment cannot begin.
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