Fat Finger Worries: How Older and Younger Users Physically

Document Sample
Fat Finger Worries: How Older and Younger Users Physically Powered By Docstoc
					Fat Finger Worries: How Older and Younger
    Users Physically Interact with PDAs



                    Katie A. Siek, Yvonne Rogers,
                    & Kay Connelly
                    Indiana University
                 The population of elderly people
                              is steadily growing
                    Population Ages 15-64 Compared to
                    Global Population




Motivation   Related Work      Experiment         Study   Findings
             Researchers are creating technology
             for older people to live independently

                     Elderly care-giving
                     assistant
                     (Girlado, et al., mPCA)




                                                   Cognitive aid to
                                                   help the elderly
                                                   (S. Carmien, MAPS)




Motivation     Related Work           Experiment         Study          Findings
                                          A majority of the related work deals
                                                with PCs and mobile phones
                                                                           Qu i ckTi m e™ a nd a
                                                                                                                  Elderly & Mobile
                                           Elderly & PCs
             QuickTime™ an d a
    TIFF (Uncompressed) decompressor                             TIFF (Un co mp res se d) de c omp res so r
       are need ed to see this picture.                            a re ne ed ed to se e th is pi c tu re.




                                                                                                                      Phones
 • Font size                                                                     • Needs assessment
 (Bernard et al., 2001)                                                          (Maguire & Osman, 2003)
 • Input Devices                                                                 • Pros and Cons
 (Smith, et al. 1999; Chaparro, et al. 1999;                                     (Abascal & Civit 2001)
 Charness, et al. 1995; Laursen, et al. 2001)

 • Input Device performance                                                      • Input recommendations
                                                                                 (Smith, et al., 1999; Maguire, et al., 2003)
 (Jacko, et al. 2003; Smith, et al. 1999;
 Laursen, et al. 2001)




Motivation                                Related Work   Experiment                                       Study      Findings
Just to review
             Do vision, dexterity, and coordination
                         effects transfer to PDAs?


               More specific goals:
               1. Compare performance between older and
                  younger participants completing
                  traditional and non-traditional tasks
               2. Study how older and younger participants
                  physically interact with PDAs




Motivation     Related Work   Experiment   Study   Findings
                                         Some of the tasks




Motivation   Related Work   Experiment   Study   Findings
                                           Some of the tasks


Dexterity                                                     Vision




Dexterity &                                                   Dexterity &
Coordination                                                  Coordination




Motivation     Related Work   Experiment   Study   Findings
                           We created two applications

                                                    Icon Size Task
                                                    Recorded preferred icon size,
                                                    smallest viewable icon, and
                                                    image preference




    Button Press Task
    Recorded errors




Motivation      Related Work   Experiment   Study      Findings
                  We used three applications that
                  came with the PDA or scanners
                                    Voice Diary Task
                                    Voice Diary lengths: 1 sec., 5 sec., 10-15 sec.
                                     Recorded how many times it took to
                                    successfully voice record message




                     Scanner Tasks
                     Scanned three items: book, can, bag
                     Recorded how many times it took to
                     successfully scan each item



Motivation   Related Work    Experiment         Study        Findings
                                Based on the literature,
                                       we predicted…

             1. Participants of all ages can press
                PDA buttons
             2. Participants of all ages prefer
                medium size (10mm or 15mm) icons
             3. Participants can record voice
                messages of various lengths
             4. Participants can scan bar codes with
                some practice


Motivation   Related Work   Experiment   Study   Findings
                                   Twenty participants
                              volunteered for the study
             Younger                                Older
         (25-30 years old)                     (75-85 years old)

 • 2 women, 8 men                         • 5 women, 5 men
 • 9 use computers often                  • 7 use computers often

 • 3 had played with a PDA                • No PDA usage

 • 6 wore glasses                         • All wore glasses

             Similar computer experience measured by the
                      amount of applications used
Motivation   Related Work    Experiment      Study   Findings
               Most participants did not make any
                mistakes for the button press task
  • 16 out of 20 participants made no
    mistakes
  • All participants were confused by
    the 5-way navigator
  • Older male participants worried
    about “fat fingers”
  • PDA held in non-dominant hand
  • No significant performance
    differences (T18=0.787; p=0.442)
                                       5-Way
                                       Navigator


Motivation     Related Work     Experiment         Study   Findings
                 There were significant differences
                           in icon preference size
      Older Preferred
      (20mm)                          • Significant differences between
                                        preferred (T18=3.37, p=0.002) and
                                        icon size they could actually see
      Young Preferred
                                       (T18=3.25, p=0.004)
      Older Can See
      (10mm)                          • Younger interested in how many
                                        icons can fit on a screen
      Large PDA Icon
      (7.76mm)                        • Older interested in details of image

      Young Can See                   • Older prefer photographs because
      (5.5mm)                           more realistic
      Small PDA Icon                  • Older had glare problems
      (5.29mm)

Motivation     Related Work   Experiment    Study      Findings
                 The voice recording task was an
                  easy task for most participants

                                    • All participants recorded short
                                      message in two tries
                                    • All of the younger participants
                                      recorded the long message on
                                      the first time
                                    • Younger and older participants
                                      held the PDA differently
                                    • No performance differences (T18<
                                     0.5, p> 0.3)




Motivation   Related Work   Experiment    Study      Findings
                      Quick review of the scanners

    Socket SDIO Scanner          Baracoda Pen Scanner




• Press PDA button            • Press scanner button
• Hold light steady           • Run pen across barcode
  across barcode
             The socket SDIO scanning task was
               slightly frustrating for participants

• Younger participants who practiced            Older more successful at
  scanning book more, scanned bag               scanning during first try
  quicker
• All participants operated PDA with
  one hand; used thumb to press                 Younger more successful at
  button                                        scanning during first try

• All participants were confused about
  what part of barcode to scan
                                                4 younger and 2 older were
• No performance differences                    able to scan within 3 tries
    (T18< 0.9, p> 0.8)


Motivation     Related Work    Experiment   Study    Findings
                                     The impossible task -
                                 Baracoda Pencil scanning
• Women had difficulty using the pencil
  because of their nails                          2 younger and 1 older
                                                  scanned on first try



                                                  Only 3 participants were
                                                  able to scan chips
• Participants wanted to see a
  scanning light
• Participants rested the PDA on the              No one successfully
  table and used two hands for the                scanned the soda
  pencil and object being scanned


Motivation    Related Work       Experiment   Study    Findings
                               Similar to our predictions,
                                 the key findings were…

             • No performance difference in button press
               and voice recording task
             • Small differences in preferred icon size -
               Younger (5mm or 10mm); Older (20mm)
             • Older participants scanned items more, but
               had the same success rate




Motivation      Related Work   Experiment   Study    Findings
                                         Future Work


• Increase sample size
• Investigate cognitive oriented tasks
• Test people with varying educational
  backgrounds
   •Test younger people outside of academia
   and older people in public assisted living
   facilities
• Have participants stand or walk
                   Implications for developing
                        applications on PDAs


• PDA applications can use current PDA buttons
• Icons will have to be larger
• Voice recording can be used for input
• Scanners can be used given enough practice time



                 Questions?
                                   What do we mean by
                                    fat finger problem?

                        People have perceptions of what they
                        can and can’t do


                        They prove themselves wrong


                        We did have problems with the
                        Baracoda (more of a nail issue)



Motivation   Related Work   Experiment   Study   Findings

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:10
posted:8/7/2012
language:English
pages:23