Summary

Kitty and Phoebe’s modeling of the bicycle products and the automated manufacturing process and apparatus is growing more sophisticated as the two learn and invent their new business. This is how it works, and from the outside looking in, I’d say they’re doing an amazing job. It is very normal for a software developer to be an expert at software design and development, but far less of an expert in their understanding of the business problems they are tasked to solve. Software projects are really an evolution involving the developer’s understanding of the business and the needs of their customers and stakeholders.

In this chapter, we learned several structural patterns that allow us to continue to make our software more sophisticated yet simple to maintain and extend. You’ve also noticed a common theme: the basic tools of inheritance and composition afforded by an object-oriented programming language are not, by themselves, enough to build...