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Took me 17 years of struggle, but I can finally explain cohesion in software design. I dropped the Cohesion chapter of the #TidyFirst book yesterday. I'll summarize here. tidyfirst.substack.com/p/cohesion #payWall
An element is cohesive if its sub-elements are coupled. A file is cohesive if all its functions have to be changed at the same time.
"Isn't that bad that they all have to be changed at the same time?"
Compared to what? Having those functions in different files is worse. It's easy to miss one.
Compared to what? Having those functions in different files is worse. It's easy to miss one.
While working on #TidyFirst this visualization of why software design is a human relationship problem popped up. Thread 
The cliche product/engineering split has someone with an idea waiting for the behavior of the system to change so they can analyze feedback. These are the “waiters” (seems enough time has passed to reuse this word).
The makers actually change the behavior of the system. They also change the structure of the system, because the structure affects how they can change the behavior.
