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The Two-handed Desktop Interface

This exploration delves into bimanual control, emphasizing how two-handed interaction enhances the desktop experience. Grounded in works by Buxton, Myers, and Guiard, it outlines the asymmetric cooperative roles of each hand—where the non-dominant hand leads and sets the frame, while the dominant hand follows for precision tasks. The significance of design for both left-handed and right-handed users is discussed, along with Microsoft’s response to improve scrolling and interaction efficiency. Bimanual control is crucial for modern user interfaces, ensuring effective multitasking.

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The Two-handed Desktop Interface

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Presentation Transcript

  1. The Two-handed Desktop Interface Are we there yet?

  2. Plan • Bimanual Control • The Desktop Interface • Scrolling • Microsoft’s Response

  3. What is Bimanual Control? • Aka, two-handed interaction • Theoretic groundwork: Buxton and Myers (1986), Guiard (1987) • Considerable recent work in HCI (Zhai, Kabbash, Hinckley, Balakrishnan, etc.) • The idea: • Two-hands work in cooperative, asymmetric manner

  4. Role of Each Hand • Non-dominant hand • leads (goes first) • sets frame of reference • works on larger, more coarse tasks • Dominant hand • follows (goes second) • works within frame of reference set by non-dominant hand • works on smaller but finer scale

  5. Two Hands Working Together

  6. Plan • Bimanual Control • The Desktop Interface • Scrolling • Microsoft’s Response

  7. Symbol keys Executive keys Modifier keys 101-Style Keyboard

  8. Frequently Used Keys Backspace Insert Home PageUp Delete End PageDown Enter Shift Alt Ctrl

  9. Where are they?

  10. The Left-Handed Desktop Desktop systemsare biased for left-handed users!

  11. Some examples...Note: Left-handed users holding the mouse in their left hand.

  12. LH: Point-click RH: Enter Select Option in Window

  13. RH: PgDn n LH: Point-Click Find and Select a Link

  14. utterly LH: Point-click-click RH: Delete Delete a Word This is some really utterly simple text.If I want to delete the word “utterly”, Idouble click on it and hit Backspace.

  15. LH: Point-click RH: Enter File System Navigation

  16. LH: Point-click RH: Enter Launch an Application

  17. Left-handed user (mouse on left side of keyboard) Point-click LH Setup Enter RH time Right-handed user (mouse on right side of keyboard) ? Temporal Analysis

  18. Savings • Small time savings but… • These tasks are extremely frequent

  19. Observations (1 of 2) • Having heard this talk, product designers will redesign the desktop to give right handers the same opportunities as left handers! No! Keyboard layout is stable and ingrained. Changes are evolutionary, not revolutionary.

  20. Observations (2 of 2) • The ideal LH and RH desktop interfaces are mirror images! No! Left handers are not mirror images of right handers. Left handers are more adept at using their non-dominant hand for trigger actions (e.g., Enter, DEL, Backspace)

  21. Plan • Bimanual Control • The Desktop Interface • Scrolling • Microsoft’s Response

  22. Scrolling and Bimanual Control • Scrolling is a classic example of a task well suited to delegation to the non-dominant hand Task Characteristics Scrolling Selecting, editing drawing, etc. • Precedes/overlaps other tasks • Sets frame of reference • Minimal precision needed (coarse) • Follows/overlaps scrolling • Works within frame of reference • Demands precision (fine)

  23. Two-handed Pointing + Scrolling Scrolling (touch strip or wheel) Pointing

  24. Dedicated cut, copy, and paste keys on left side of keyboard (ideal for RH users) Postscript • Xerox Star, circa 1981

  25. Plan • Bimanual Control • The Desktop Interface • Scrolling • Microsoft’s Response

  26. Microsoft Office Keyboard

  27. Thank you!

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