The answer
Whenever practical, include enough of the interface, data flow, and validation to demonstrate a useful outcome. Some technical foundations may be separate supporting increments.
Why should features be implemented incrementally?
Should each increment be a complete user journey?
More FAQs in Why should features be implemented incrementally?
They narrow the set of recent changes and assumptions. When behavior breaks, developers can inspect a smaller difference and reproduce the affected journey more directly.
Yes. An agreed architecture provides direction, while increments implement and validate pieces of it. Update the architecture deliberately when evidence reveals a necessary change.
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