Case Study · State Street · July to October 2004
Project Manager · via ECL Management Consultants
The business case was a checklist that reached zero.
The Brief
The hard part was that two estates had to become one (people, processes and systems from the transferring business landing inside the receiving organisation's operating model) with client service uninterrupted throughout, across multiple vendors, each with their own contract and their own interests. And the benefit was conditional: transfers routinely capture the migration and defer the decommissioning, leaving duplicate systems running 'temporarily' for years and the business case unrealised.
The Approach
The transfer ran on formal RAID discipline: risks, assumptions, issues and dependencies logged, owned and worked as the shared single source of truth across every vendor and internal team, because an issue without an owner is an issue that surfaces at cutover, and a dependency nobody tracks is a delay nobody expects. Decommissioning was managed as first-class delivery scope, not an afterthought: each of the twelve redundant systems was verified as fully superseded by the target estate before being switched off.
Fig. 01 · Twelve systems retired, each verified first
Twelve systems off, each verified first.
Prove supersession before switching anything off. In a live operations environment a retirement is irreversible in practice, so each system was switched off only once its functions were verified as fully covered.
Twelve systems retired, each verified as fully superseded first. System names withheld; recreated from the delivery record.
Judgement Call
Prove supersession before switching anything off. Decommissioning a system in a live operations environment is irreversible in practice, so each retirement happened only once its functions were verified as fully covered. Caution about what to switch off, and evidence-backed confidence when switching it off, are the same judgement exercised decades later in deciding what to automate and what to leave manual.
What Was Delivered
- The operations transfer completed with service continuity maintained throughout
- Formal RAID-driven coordination across multiple vendors and internal teams: named deliverables, named owners, visible status
- Twelve systems verified as superseded and decommissioned
- €1M in recurring annual savings, delivered, not just modelled
The Outcome
The transfer completed in a four-month window with the consolidation benefit actually captured. The engagement's lasting contribution: a business case is only delivered when the old estate is switched off, and the transferable habit is managing the benefit as scope, with the same rigour as the migration itself.