Incremental beats big-bang, almost always
The full rewrite is the project most likely to fail, because it asks the business to wait months for value while carrying the old system anyway. We prefer the strangler pattern: stand a modern layer in front of the legacy system, move one capability across at a time, and route traffic to whichever side owns it. The old system shrinks release by release, the business never stops, and you can pause or re-sequence whenever priorities change.



