Bias and noise—systematic deviation and random scatter—are different components of error. The targets illustrate the difference. (Location 89)
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Some judgments are biased; they are systematically off target. Other judgments are noisy, as people who are expected to agree end up at very different points around the target. Many organizations, unfortunately, are afflicted by both bias and noise. (Location 92)
A general property of noise is that you can recognize and measure it while knowing nothing about the target or bias. (Location 98)
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Wherever you look at human judgments, you are likely to find noise. To improve the quality of our judgments, we need to overcome noise as well as bias. (Location 137)