29.3. Incremental Integration Strategies | Code Complete: A Practical Handbook of Software Construction, Second Edition
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Top-Down Integration
Bottom-Up Integration
Sandwich Integration
Feature-Oriented Integration
Feature-oriented integration offers three main advantages. First, it eliminates scaffolding for virtually everything except low-level library classes. The skeleton might need a little scaffolding, or some parts of the skeleton might simply not be operational until particular features have been added. When each feature has been hung on the structure, however, no additional scaffolding is needed. Since each feature is self-contained, each feature contains all the support code it needs.
The second main advantage is that each newly integrated feature brings about an incremental addition in functionality. This provides evidence that the project is moving steadily forward. It also creates functional software that you can provide to your customers for evaluation or that you can release earlier and with less functionality than originally planned.
A third advantage is that feature-oriented integration works well with object-oriented design. Objects tend to map well to features, which makes feature-oriented integration a natural choice for object-oriented systems.
T-Shaped Integration
In this approach, one specific vertical slice is selected for early development and integration
That slice should exercise the system end-to-end and should be capable of flushing out any major problems in the system's design assumptions
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