What are the following things an user interface designer should keep in mind while designing a product?
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Users' motor skills
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Users' educational skills
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Users' environmental profile
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Users' economic status
Interface designers must consider user motor skills, such as dexterity and target sizing, to ensure buttons and interactive elements are easy to click or tap without frustration.
Human-factors/UX literature (e.g., Shneiderman's user-profile framework, Google UX Design curriculum on inclusive design) consistently lists physical/motor abilities, educational/cognitive level, environmental/cultural context, and economic/socioeconomic status as ALL legitimate, commonly-cited factors a UI/UX designer should account for when designing for diverse users. None of the four is singularly 'the' correct factor to the exclusion of the other three -- they are complementary considerations, not mutually exclusive options.