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A professor told me “The key to good design is experience. The key to experience is bad design.”

I think if you:

1) Don’t use global variables 2) Use interfaces liberally 3) Assume implementations will need to change

This gets you a lot of the way there.

Those are guidelines for writing code, not for doing software architecture.

Very true but poor code can undo good architecture.

A good plan is to keep the code as tidy as you can.