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System image the visible part of the device being

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Unformatted text preview: breaking; wood affords solidity, opacity, support, carving) Affordances provide us clues on how to operate a device CONSTRAINTS – limits to the perceived operation of a device (e.g. a small hole vs. a large hole- we might be able to use only one finger in the small hole, while we might be able to use multiple fingers in a large hole) CONCEPTUAL MODEL – our mental simulation of a device’s operation (mental model?) These can be based on MAPPINGS, AFFORDANCES and CONSTRAINTS. MENTAL MODEL – models people have of themselves, others, their environment, and the things they interact with (CONCEPTUAL MODELS are part of this) The mental model of a device is formed by interpreting its perceived actions and its visible structure. System Image – the visible part of the device being used. If incomplete / contradictory, the user cannot easily use the device. Feedback – sending information back to the user about what action has actually been done and what result was accomplished Two principles of designing for people: 1. good conceptual model 2. make things visible Norman’s Conclusion: Design is not an easy task. Technology is a paradox because it is supposed to make our lives easier when it often makes it more difficult. However, this is not an excuse for poor design. Chapter 2: The Psychology of Everyday Actions People feel bad, sorry, frustrated, stupid for not knowing how to operate mechanical things, especially if the task appears to be trivial The world, and everyday things, are filled with misconceptions Aristotle's naive physics - our 'naive' way of explaining the phenomenon we witness in everyday life - often very practical but incorrect. People often have naïve, incorrect explanations for real world phenomenon (cranking the thermostat all the way will make us reach a desired temperature faster) Coincidence can set our ‘causal’ wheels rolling. What matters is that we ‘perceive’ causality, and whether or not that causality exists, we think it is there. Often we perceive causality that isn’t there and often ignore the real cause. This can create a problem / crisis later because we have a bad explanation of what is happening (3 Mile Island...
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This note was uploaded on 01/22/2014 for the course CMS 367 taught by Professor Browning during the Spring '08 term at University of Texas.

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