... all models (mental and otherwise) are simplifications. They necessarily omit many aspects of the realities they represent. This leads to a very important statement that will be repeated several times throughout this Guide. The statement is a paraphrase of something W. Edwards Deming (the father of the “Quality movement”) once uttered: “All models are wrong, some models are useful.” It’s important to dredge this hallowed truth back up into consciousness from time to time to prevent yourself from becoming “too attached” to one of your mental models. Nevertheless, despite the fact that all models are wrong, you have no choice but to use them—no choice that is, if you are going to think. If you wish to employ non-rational means (like gut feel and intuition) in order to arrive at a conclusion or a decision, no mental model is needed.
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