How to Write an Effective Software Design Document · Refactoring English

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A good design doc can save you years of development time. Writing a design doc forces you to think through important decisions before you waste time on the wrong implementation or paint yourself into a corner. It’s also the best way to coordinate design decisions among teammates and partner teams.

I’ve written design docs as a developer at Google, Microsoft, and within my own companies. The specifics vary, but the underlying principles remain the same. A design doc should articulate the hard problems you’re solving and help your teammates give you feedback.