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DDVE design class. Humans and interfaces

Jaanus Kase
December 12, 2011

DDVE design class. Humans and interfaces

I presented this material with my colleague Priidu Zilmer as part of a two-day design workshop for Tartu University’s Design and Development of Virtual Environments Master’s program. See www.ddve.ee for more info.

Jaanus Kase

December 12, 2011
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  1. Humans and interfaces

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  2. Consider your users
    • Gender, age, education, family
    • Mood
    • Time
    • Environment
    • Language skills
    • Other activities

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  3. Humans as devices
    • Input: visual, auditory, touch
    • Processing: cognition, memory
    • Output: mouse, keyboard, touchscreen

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  4. Model Human Processor
    Card, S.K; Moran, T. P; and Newell, A. The Model Human Processor: An Engineering Model of Human Performance.

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  5. Keystroke-level modeling

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  6. Fitts’s Law
    Time to target is a function of target distance
    and size.

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  7. Hick’s law
    The time to make a decision is a function of the
    number of choices. More choices = longer.
    • Oranges
    • Apples
    • Oranges
    • Apples
    • Cabbage
    • Carrot
    • Cherries

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  8. Useful timing constants
    • 50-100ms: “instantaneous”
    • 1-2s: common delay in networks
    • 10-15s: serious breakdown, forgotten context

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  9. Touch target size
    • Apple: 44x44 px on 164ppi (iPhone)
    • 0.7-1.0 cm

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  10. UI evolution: command line

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  11. UI evolution: GUI/WIMP

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  12. UI evolution: touch

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  13. UI evolution: voice

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  14. “Pictures Under Glass”
    Bret Victor. A brief rant on the future of interaction design

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  15. “Are we really going to accept an
    Interface Of The Future that is less
    expressive than a sandwich?”
    Bret Victor. A brief rant on the future of interaction design

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