Download - Usability Study Mouse Zoom
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The Effect of Mouse Scroll-wheel Configuration on Virtual Globe NavigationAmenity ApplewhiteYikalo HayelomJia Wang
Usability Study
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Outline• Introduction
• Motivation
• Hypothesis
• Study Methodology
• Results & Discussion
• Conclusion
• Recommendation2
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Introduction: Mouse Zoom Available in many applications:
Microsoft Office, AutoCAD, ArcMap, Photoshop...
Default setting:
• “Push” forward
• “Pull” back
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Introduction: Virtual Globes • Streaming satellite imagery in 3D
• Zoomable User Interface ZUIinformation navigation best supported by natural and geographic ways of thinking*
4*Perlin & Fox 1993
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Introduction: Virtual Globes Four ways to zoom:
• Double-click
• Mouse scroll-wheel 5
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Introduction: Virtual Globes Four ways to zoom:
• Double-click
• Mouse scroll-wheel 5
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Introduction: Virtual Globes Four ways to zoom:
• Double-click
• Mouse scroll-wheel 5
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Motivation• Increasing popularity of virtual globes
• Main ZUI navigation problem: users may get “lost” while zooming*
• Need to provide intuitive tools for a usable interface
Compare the usability of two zoom configurations.
6*Buring, et al 2006
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MethodologyHypothesis
Despite the fact that most software shares the same default setting for mouse zooming, users will be able to adjust to the default configuration without a marked decrease in usability.
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MethodologyUsability (adapted from Nielsen)
Learnability ease of accomplishing task the first time
Errors number of errors and ease of recovery
Satisfaction pleasant to use design?
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MethodologyTest design
Participants 6 classmates: 4 males, 2 females; 23-29
Simple task instrucions• 4 screenshots in Google Earth,
pasted into Word
• Instructed only to use mouse wheel for movement
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Methodology
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MethodologyTest design
Two sessions First with default zoom, second reverse
Recorded with CamStudio
Facial expressions and speech noted
Post study interview, scale 1-5• Difficulty
• Enjoyment10
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MethodologyTest design
Errors & Learnability• number of errors counted in second
half of tasks in both sessions
• compared results individually
Enjoyment• observed during session
• reported during interview11
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MethodologyTest design
Criteria to accept hypothesis• an increase of errors with reverse
configuration no greater than 10%
• no significant decrease in enjoyment - observed or reported
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Results
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1
2
3
4
5
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0 0.075 0.150 0.225 0.300
Increase in zoom errors with reverse setting
Use
r
• Difference in errors
with reverse setting
greater than 10%
for 4 users
7.5% 15% 22.5%
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Results
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1
2
3
4
5
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0 0.075 0.150 0.225 0.300
Increase in zoom errors with reverse setting
Use
r
• Difference in errors
with reverse setting
greater than 10%
for 4 users
7.5% 15% 22.5%
12.38%
20%
20.55%
13.18%
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Results• All users performed
more zooms with
reverse setting
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1
2
3
4
5
6
0 20 40 60 80
Total Number of Zooms
Use
r
Test 1 default zoomTest 2 reverse zoom
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Results• Two users noticed the change immediately
• One vocalized frustration throughout task with reverse setting
• One user reported that the reverse setting was more difficult
• No one reported the reverse setting was less enjoyable
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ConclusionMust reject hypothesis:
• Increase in errors was greater than 10% for the majority of users; not learnable!
• Reported and observed decrease in enjoyment; not enjoyable!
• Questions raised about efficiency, more zooms
Ultimately, the reverse setting seems to have lower usability. 16
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Recommendation• Some users not affected by reverse setting
• Using the scroll wheel instead of double-click was very difficult for some users
• We recommend that virtual globe interfaces offer a range of zooming methods and allow users to adjust the configurations
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ReferencesBüring, T., Gerken, J., and Reiterer, H. 2006. Usability of overview-supported zooming on small screens with regard to individual differences in spatial ability. In Proceedings of the Working Conference on Advanced Visual interfaces (Venezia, Italy, May 23 - 26, 2006). AVI '06. ACM, New York, NY, 233-240.
Perlin, K. and Fox, D. 1993. Pad: an alternative approach to the computer interface. In Proceedings of the 20th Annual Conference on Computer Graphics and interactive Techniques SIGGRAPH '93. ACM, New York, NY, 57-64.
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Questions?
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