The Two-handed Desktop Interface

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Presentation transcript:

The Two-handed Desktop Interface Are we there yet?

Plan Bimanual Control The Desktop Interface Scrolling Microsoft’s Response

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

Role of Each Hand Non-dominant hand 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

Two Hands Working Together

Plan Bimanual Control The Desktop Interface Scrolling Microsoft’s Response

101-Style Keyboard Symbol keys Executive keys Modifier keys

Frequently Used Keys Backspace Insert Home Page Up Delete End Page Down Enter Shift Alt Ctrl

Where are they?

The Left-Handed Desktop Desktop systems are biased for left-handed users!

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

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

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

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

File System Navigation Enter LH: RH: Point-click

Launch an Application Enter LH: RH: Point-click

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

Savings Small time savings but… These tasks are extremely frequent

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.

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)

Plan Bimanual Control The Desktop Interface Scrolling Microsoft’s Response

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)

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

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

Plan Bimanual Control The Desktop Interface Scrolling Microsoft’s Response

Microsoft Office Keyboard

Thank you!