Refactoring Inhibitors
With the notion of using simple, incremental design as your primary design driver, the refactoring step is where much of the real work gets done. Anything that keeps you from refactoring easily, or even from wanting to refactor, is bad. Very bad. When you stop refactoring incrementally, your system will start degrading quickly.
Be on guard for the following inhibitors to refactoring:
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Insufficient tests: Following TDD provides you with fast tests for every small bit of discrete logic you build into your system. These tests provide you with high confidence to change the code for the better. In contrast, when you have fewer fast unit tests and thus lower test coverage, your interest and ability to refactor shrinks dramatically. ...
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