Donald A. Norman

What makes something simple or complex? It’s not the number of dials or controls or how many features it has: It is whether the person using the device has a good conceptual model of how it operates.

What makes something simple or complex? It’s not the number of dials or controls or how many features it has: It is whether the person using the device has a good conceptual model of how it operates.

– Donald A. Norman –

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Robert L. Millet

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