Upgrade to Pro — share decks privately, control downloads, hide ads and more …

DDVE design class. Humans and interfaces

1591ee5da3f4480605ace6fcc0b8d43f?s=47 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


  1. Humans and interfaces

  2. Consider your users • Gender, age, education, family • Mood

    • Time • Environment • Language skills • Other activities
  3. Humans as devices • Input: visual, auditory, touch • Processing:

    cognition, memory • Output: mouse, keyboard, touchscreen
  4. Model Human Processor Card, S.K; Moran, T. P; and Newell,

    A. The Model Human Processor: An Engineering Model of Human Performance.
  5. Keystroke-level modeling

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

    distance and size.
  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
  8. Useful timing constants • 50-100ms: “instantaneous” • 1-2s: common delay

    in networks • 10-15s: serious breakdown, forgotten context
  9. Touch target size • Apple: 44x44 px on 164ppi (iPhone)

    • 0.7-1.0 cm
  10. UI evolution: command line

  11. UI evolution: GUI/WIMP

  12. UI evolution: touch

  13. UI evolution: voice

  14. “Pictures Under Glass” Bret Victor. A brief rant on the

    future of interaction design
  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