I recently worked on a software metrics tool, which taught me a lot about the architecture of some of my work.

Then I calculated the difference in metrics between mine and previous commits, plotted the results, and looked at my personal progress. Nothing!

Coupling is about how objects in your application are connected: which objects depend on which, and how does that affect the entire system’s stability?

An application has tight coupling when a lot of components depend on each other. This should usually be avoided because a change in 1 place can cause issues in any of its dependencies.

So what does coupling tell you about your classes?

When asked for estimates, you usually don’t have much more than your gut feeling to go on. You just know that this one thing is going to take longer because it’s more fragile than that other thing. But why is that?

People much smarter than me have researched this subject and there are good ways of measuring how complex a piece of code is.