The most powerful mental models are hierarchical: simple at a high level, but highly precise when you need to zoom in.
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Good software APIs should reflect the mental models of domain experts: the syntax should match the most intuitive and most effective way to think about the underlying problem.
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A side effect is that good APIs are modular and hierarchical -- they feel simple at a high level, but they are precise & expressive when you need it.
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Tools are a reflection of how to think about problems. Good tools are shaped by good mental models, and in turn, they shape the way of thinking of their users.
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