This change series enables features to be implemented in the new and old system without additional cost. This additionally reduces the risk of replacement project never finishing.

Habit: Shell System

Organization ROI: Always remain shippable, reduce risk from partially-done work. Engineer ROI: Migrate each feature into a working system, so you are done-done with a feature when you finish.

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Habit: Explicit Dependencies

Organization ROI: Allow migrating features in any order, regardless of how entwined the code is with other features. Engineer ROI: Dependencies in the old system become obvious so they can be handled differently in the new system.

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Habit: Dual-Home Features

Organization ROI: Continue shipping new features without delaying the legacy rewrite. Engineer ROI: Write new features once, in ways that work in both old and new systems.

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Habit: Cross-System Sharing

Organization ROI: Reuse the good parts of your existing system even while creating a new system to replace the bad parts. Engineer ROI: Re-use code between old and new systems.

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