This part was confusing and possibly useless. The source oreilly article (https://www.oreilly.com/content/software-architecture-patter...) cites a web browser-based auction site. That doesn't sound very "data decoupled" to me when each browser needs up-to-the-second updates on bids.

They are better explained here: https://www.oreilly.com/content/software-architecture-patter...

This analysis is a badly regurgitated copy of the free O'Reilly e-book about software architectures by Mark Richards located at http://www.oreilly.com/programming/free/software-architectur...

It's a lot worse than the original.

I definitely support direct linking to things on the Web, but since O'Reilly probably meant for this to only be grabbed via an initial landing page, I figured I'd link to it too in case anyone wants some background separate to the PDF: http://www.oreilly.com/programming/free/software-architectur...