I've always felt that a proper Object-Oriented design must be focused on package and class relationships, and that those relationships should be loosely coupled.
Bob Martin wrote a book back in 1995 called Designing Object-Oriented C++ Applications Using the Booch Method. Chapter 3 of this book explained how to design a loosely coupled architecture based on cohesion and closure. Then in 2006 Bob and his son wrote Agile Principles, Patterns, and Practices in C#. Chapter 28 of this book revisited the topic of loosely coupled architectures.
I have always felt that this topic is crucial to both architecture and design of Object-Oriented solutions, and thus I often revisit the chapters from these books. I finally decided to encapsulate Bob's content into a single page diagram (taken from the second book).
Click here to get it!
Keep this single-page diagram near and dear to your heart...and read Bob's second book, twice.
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