Take a piece of software you wrote more than a year ago. Is it documented adequately?

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 Take a piece of software you wrote more than a year ago. Is it documented adequately? Does it have a user manual? Is the design rationale reflected in the technical documentation? Can you build an understanding of the system from its documentation that is sufficient for making non-trivial changes to it?

Repeat these questions for a system written by one of your colleagues.

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