15. Design Patterns

One of the interesting things about software development is that when you create a software system, you are actually modeling a real-world system. For example, in the Information Technology industry, it is safe to say that IT is the business—or at least IT implements the business. To write the business software systems, the developers must thoroughly understand the business models. As a result, the developers often have the most intimate knowledge of a company’s business processes.

We have seen this concept throughout this book as it relates to our educational discussions. For example, when we discussed using inheritance to abstract out the behaviors and attributes of mammals, the model was based on the true real-life model, ...

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