Application modernization is often introduced as a technology program, but the first question is about value. Which capability needs to become safer, faster, or easier to change?
Choose a meaningful slice
A meaningful modernization slice names the user or team that needs a better outcome, maps the current path and its sharpest constraint, and proves progress without hiding risk.
The goal is not to move every line of code at once. It is to create a more changeable part of the system while learning enough about the old part to make the next decision.
Modernization is a sequence of better decisions, not a single destination.
A meaningful outcome keeps the work connected to the people who need the system to improve.