“Our codebase is easy to understand. You won’t need more than a couple of hours. You’ll be productive right away! Guaranteed!” It’s Dave, your colleague developer, explaining to a new employee how one of the codebase of your company shines like a diamond. The three of you work at MegaCorpMoneyMaker, the famous e-commerce. Looking at the codebase, with its millions of lines of code, arbitrary boundaries, and unexpected dependencies, you wonder how Dave can have so much confidence in his “explanations”.