Software Development and Professional Practice

C H A P T E R  10

Object-Oriented Design Principles

Devotion to the facts will always give the pleasures of recognition; adherence to the rules of design, the pleasures of order and certainty.

—Kenneth Clark

How can I qualify my faith in the inviolability of the design principles? Their virtue is demonstrated. They work.

—Edgar Whitney

Now that we’ve spent some time looking at object-oriented analysis and design, let's recapitulate some of what we’ve already seen and add some more pithy prose. First, let's talk about some common design characteristics.

First, designs have a purpose. They describe how something will work in a context, using the requirements (lists of features, user stories, and use cases) to define the context. Second, designs ...