tags: #publish links: [[Cognitive Biases]] created: 2021-09-25 Sat --- # McNamara Fallacy Or **Quantitative Fallacy** Making a decision based *only* on quantitative data/metrics can result in incorrect decisions, misleading conclusions, losing touch with the real circumstances - hence is a dangerous policy in isolation. This is because if you only look at metrics, you tend to: - Ignore things that can't easily be measured - Distort / incorrectly estimate things that can't be measured accurately https://en.m.wikipedia.org/wiki/McNamara_fallacy related: [[Goodhart’s Law]]