The core to a successful legacy displacement is the gradual replacement of legacy with new software, as this allows benefits to delivered early and circumvents the risks of a Big Bang. During displacement the legacy and new system will have to operate simultaneously allowing behavior to be split between old and new.
Ian Cartwright, Rob Horn, and James Lewis explain how to build and evolve a Transitional Architecture that supports this collaboration as it changes over time. For this to work, intermediate configurations may require integrations that have no place in the target architecture of the new system.
Or to put this more directly - you will have to invest in work that will be thrown away.
more… https://martinfowler.com/articles/patterns-legacy-displacement/transitional-architecture.html
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