BCG · Technology / Operations · Intermediate · 25-35 min

Retire legacy systems and consolidate technology footprint

Last updated 2026-07-29

What is this case about?

A large retail bank operates 40+ legacy systems built on deprecated technology (COBOL, mainframe) that costs $200M annually to maintain. Business capabilities have been replicated in modern systems. Develop a legacy system retirement strategy.

Where strong candidates start

  • Legacy system inventory and dependency mapping
  • Business criticality and retirement sequencing

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