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Convenience — convenient, handy, and appropriate use for all who would use them. This means such things as convenient use, transport, packaging, storage, operation, cleaning and repair.
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Ease of Use — simple, uncomplicated, and easy to use. Designs should offer readable and understandable instructions and directions, simple operations, and logical controls that do not confound our intelligence, and easy use that does not tire our muscles, or defy our dexterity—regardless of our age or ability.
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Ergonomic
Fit — physical and sensory accommodation
and fit for the widest possible range of appropriate
human dimensions. Designs recognize that while bodily
dimensions and abilities reach their full limits during our late teens
and early twenties, they also diminish as we age.
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Suitability — appropriateness of size, function, appearance, adjustability, accommodation, and symbolism.
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User Value — infusing 'utility' with user-sensitive value-added perceptions, components, and features. Value satisfies consumers' desire by translating their expectations into positive reactions, thereby maintaining self respect, extending independence, and promoting satisfaction.