In an ideal situation, such a module has all the parts of code it needs to operate (logic, infrastructure, database access layer, UI). Especially, there should be no shared business logic. Also a module should be able to operate when other modules enter fault mode. In real designs, though, it often turns out that some parts have to be extracted - most often it’s the UI or some infrastructure code or some shared libraries.
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But there’s a second hindrance that has been growing stronger.