3461 the two-handed desktop interface are we there yet?
TRANSCRIPT
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The Two-handed Desktop Interface
Are we there yet?
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Plan Bimanual Control The Desktop Interface Scrolling Microsoft’s Response
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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
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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
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Two Hands Working Together
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Plan Bimanual Control The Desktop Interface Scrolling Microsoft’s Response
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101-Style Keyboard
Symbol keys
Executive keys
Modifier keys
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Frequently Used Keys
Insert HomePageUp
Delete EndPage
Down
Enter
Shift
CtrlAlt
Backspace
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Where are they?
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The Left-Handed Desktop
Desktop systemsare biased forleft-handed users!
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Some examples...
Note: Left-handed users holding the mouse in their left hand.
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Select Option in Window
Enter
LH:
RH:
Point-click
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Find and Select a Link
RH:
PgDn
LH:
n
Point-Click
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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.
Delete
LH:
RH:
Point-click-click
utterly
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File System Navigation
Enter
LH:
RH:
Point-click
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Launch an Application
Enter
LH:
RH:
Point-click
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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)
?
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Savings Small time savings but… These tasks are extremely frequent
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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.
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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)
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Plan Bimanual Control The Desktop Interface Scrolling Microsoft’s Response
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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, editingdrawing, etc.
• Precedes/overlaps other tasks • Sets frame of reference• Minimal precision needed (coarse)• Follows/overlaps scrolling• Works within frame of reference• Demands precision (fine)
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Two-handed Pointing + Scrolling
Pointing
Scrolling(touch strip or wheel)
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Postscript Xerox Star, circa 1981
Dedicated cut, copy, and paste
keys on left side of keyboard (ideal for
RH users)
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Plan Bimanual Control The Desktop Interface Scrolling Microsoft’s Response
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Microsoft Office Keyboard
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Thank you!