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That's a good metric. You can make it slightly more involved by not only counting mistakes, but also when those mistakes would have to occur.

For the climbing: The loose rock can occur while you are distracted. But you can tie up the harness at your leisure and with friends checking.

From a software development perspective, that's also why automated testing is better than manual testing. You can write the automated tests when you have time, and they will work even when you are under stress.

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