Ten. Supple Design

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The ultimate purpose of software is to serve users. But first, that same software has to serve developers. This is especially true in a process that emphasizes refactoring. As a program evolves, developers will rearrange and rewrite every part. They will integrate the domain objects into the application and with new domain objects. Even years later, maintenance programmers will be changing and extending the code. People have to work with this stuff. But will they want to?

When software with complex behavior lacks a good design, it becomes hard to refactor or combine elements. Duplication starts to appear as soon as a developer ...

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