Modernising core systems one piece at a time

Key points

• Replacing a core system in one step carries the highest risk.
• Breaking it into parts lets you show value early.
• Each step needs its own way back if something goes wrong.

Why staged change works

Moving one capability at a time keeps the business running, lets teams learn as they go, and shows results long before the whole programme is finished.

How to plan the stages

Map the system’s capabilities and their dependencies, start where value is high and risk is low, and run old and new side by side until the new part is proven.

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