3 years ago

We have spent most of the last couple of decades helping large organizations overhaul their legacy systems. Too often we've seen organizations stuck on a treadmill of half-done legacy replacement efforts.

We have worked with many organizations who have made multiple attempts at removing legacy systems.

We have seen lots of examples of where business processes have evolved next to legacy systems, the processes become tightly coupled to the way that system works with constraints in the system and often workarounds "off system" shaping the business processes people follow to do their jobs.

https://martinfowler.com/articles/patterns-legacy-displacement/legacy-mimic.htmlNew system interacts with legacy system in such a way that the old system is not aware of any changes.