Leaders always say they learned from their errors, so make some mistakes on purpose, Dan and Chip Heath write in their book "Decisive: How to Make Better Choices in Life and Work." They describe how one company made a deliberate mistake that led to $1 million in consulting jobs. "Most of your 'deliberate mistakes' will fail, and in fact that failure should be encouraging, because it means you've been making the right assumptions all along," they write.

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