David A. Wheeler writes:
Since the whole book revolves around the nine rules, it might help to understand the book by skimming the rules and their sub-rules:
- Understand the system
- Make it fail
- Quit thinking and look
- Divide and conquer
- Change one thing at a time
- Keep an audit trail
- Check the plug
- Get a fresh view
- If you didn’t fix it, it ain’t fixed
‘Quit thinking and look’, ‘Check the plug’, and ‘If you didn’t fix it, it ain’t fixed’ are true, and absolute zingers!