Decommissioning is the last phase in the lifecycle. This is typically initiated when the system reaches the end of its defined lifecycle and is replaced by a new system, planning how this migration takes place is therefore an important consideration.
In any case, the high-level process for system decommissioning may require migrating to a receiving or target system data or business functions that have been supported by a legacy system that is to be decommissioned. This will comprise different administrative and technical activities whose purpose is to remove or to minimise risks after the system is shut down.
As part of this stage, there should be strict adherence to mandates and regulations relating to contract termination, dispositioning of assets, coordination of , records management (including retention), transition of remaining fiscal management duties, and the placement of staff.
The prior steps of the lifecycle need to define and plan for the lifespan of the system and its decommissioning to:
Initiate preparatory activities for the implementation of successor systems in a planned, timely and cost-effective manner.