The Undo — Making Changes Without Breaking Things

Most things break right after a change — so change carefully and reversibly. Know what a change touches, have a way to put it back, change one thing at a time, check it worked, and tell people. Never rush a change, and never wave a small one through.

What you'll learn

• Understand that changes are when things break, and know what a change touches before you make it.
• Have a way to undo a change before you make it, and change one thing at a time so a breakage points to its cause.
• Check a change worked and broke nothing else, tell the people it affects, and keep a simple note of what changed.
• Avoid rushing a change under pressure and waving a small one through — giving every change proportionate care.

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