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PDA Usability Vidya Narayan The University of Texas at Austin School of Information LIS 382L.15 PDAs Ubiquitous ? Going beyond just a Personal Digital Assistant Various new and novel applications Data collection GPS Survey tools Displaying Text in PDAs PDA have small screens

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Pda usability l.jpg

PDA Usability

Vidya Narayan

The University of Texas at Austin

School of Information

LIS 382L.15

Vidya Narayan

LIS 385T.6


Slide2 l.jpg
PDAs

  • Ubiquitous ?

    • Going beyond just a Personal Digital Assistant

    • Various new and novel applications

      • Data collection

      • GPS

      • Survey tools

Vidya Narayan

LIS 385T.6


Displaying text in pdas l.jpg
Displaying Text in PDAs

  • PDA have small screens

    • Displaying lot of text is tricky

    • Can methods without scrollbars be used?

  • Rapid Serial Visual Presentation (RSVP)

    • Series of single words

    • Compared to 3-line or 10-line text scrolling

Vidya Narayan

LIS 385T.6


Slide4 l.jpg

Displaying text (contd)

  • RSVP comparable to both 3-line and 10-line scroll at low word speeds but performs much better at higher word speeds

Vidya Narayan

LIS 385T.6


Input of text data l.jpg
Input of text data

  • Traditional PDAs use stylus and touchscreen to input data

    • Graffiti software used to read cursive way writing

      • Usually needs significant training (of User!)

      • 85%-93% accurate

    • Use of touchscreen keypad and stylus

      • Extremely slow and cumbersome

      • 16-18 wpm

Vidya Narayan

LIS 385T.6


Slide6 l.jpg

Input of text data (contd)

QWERTY

T9

Large pads

Small pads

Vidya Narayan

LIS 385T.6


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Input of text data (contd)

  • Participants using QWERTY keyboard consistently showed better transcription rates

QWERTY

(squares)

T9

(circles)

Vidya Narayan

LIS 385T.6


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Input of text data (contd)

  • Some of the newest PDAs are offering QWERTY keyboards

Vidya Narayan

LIS 385T.6


Slide9 l.jpg

Combining multiple devices

Phone and PDA in two units but well connected

Phone and PDA in one unit

Vidya Narayan

LIS 385T.6


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Combining multiple devices (contd)

Increased complex Call handling

Increased complex Information retrival

Vidya Narayan

LIS 385T.6


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Conclusion

  • Usability becoming a key issue in new product design

    • Designers need to consider user abilities and preferences

    • Complexity of PDA is ever-increasing

      • What about the novice user?

Vidya Narayan

LIS 385T.6


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