The three levels of processing that designers should consider according to Don Norman are: 1. Visceral, which refers to automatic responses. 2. Behavioral, which refers to well-learned actions triggered by situations. 3. Reflective, which refers to conscious opinion in hindsight. Design must take place at all these levels for a product to be effective.

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Designers need to consider principles beyond logic, such as psychology and cognitive science, because these principles help in creating products that are user-friendly and intuitive. Understanding how the human mind works can help designers predict how users will interact with their products. This can lead to designs that are more effective, efficient, and satisfying for the user. For example, understanding cognitive science can help designers create products that align with how our memory works, making them easier to use and remember. Similarly, understanding psychology can help designers tap into emotions, creating products that are not only functional but also enjoyable and engaging.

Good design can induce positive emotions such as pride, enjoyment, and calm by considering three levels of processing: visceral, behavioral, and reflective. Visceral responses are automatic and can be triggered by aesthetically pleasing elements. Behavioral responses are triggered by well-learned actions, so a design that is intuitive and easy to use can induce feelings of enjoyment. Reflective responses are conscious opinions formed in hindsight, so a design that meets or exceeds expectations can induce feelings of pride and calm.

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The Design of Everyday Things

How do designers improve their products to work around flaws in human logic? In The Design of Everyd...

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