PhoneCom2011 panel - Guanling Chen

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This document discusses usability challenges for the PhoneCom mobile application. It provides details on Android UI frameworks, recorded user events and interactions, usability metrics, and challenges identified through usability testing. Key areas covered include the Android dialog and button widgets, a state machine model of user flows, traffic flow charts showing correct and incorrect paths, and usability problems detected through event logging.

Technology Design

Usability Challenges
for PhoneCom
Guanling Chen
University of Massachusetts Lowell
http://www.cs.uml.edu/~glchen/

Android UI Framework

Dialog

Button Widget
(View Class)

AdapterView
(ViewGroup)

Menu

9

Recorded Events

Recorded
Android
UI
Events
are
summarized
in

the
following
table,
classiﬁed
by
their
adhering

window

Unhandled Area
10

State Machine Model
Expert
State
Machine:

Expert
States
and
Transi3ons:

11

Traffic Flow Chart
User
Traﬃc
Flow
Chart:
Incoming
ﬂow

Outgoing
ﬂow

Flow
to
Mistake

States

Backtracking

ﬂow

Mistake
States
and
Transi3ons:

12

Reported Metrics

Signs
for
poten3al
usability
problems:

-‐ Too
many
backtracking

-‐ Par0cipants
cannot
complete
one
step

-‐ Low
correct
ﬂow
ra0o

13

Evaluation
Usability
Problems
idenFﬁed
by
Event
Logging
Tool:

*
Numbers
in
parenthesis
are
problems
idenFﬁed
by
Laboratory-‐
based
Usability
tesFng
method:

-‐  Good
at
iden3fying
cri3cal
(major
and
catastrophe)

usability
problems.

-‐  Not
good
at
iden3fying
cosme3c
usability
problems.

14

Challenges

•  More precise analysis model with
semantics
•  Integration with context
•  Inspection before deployment

15

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PhoneCom2011 panel - Guanling Chen

1. Usability Challenges for PhoneCom Guanling Chen University of Massachusetts Lowell http://www.cs.uml.edu/~glchen/

8. Mobile Usability Testing 8

9. Android UI Framework Dialog Button Widget (View Class) AdapterView (ViewGroup) Menu 9

10. Recorded Events Recorded Android UI Events are summarized in the following table, classiﬁed by their adhering window Unhandled Area 10

11. State Machine Model Expert State Machine: Expert States and Transi3ons: 11

12. Traffic Flow Chart User Traffic Flow Chart: Incoming flow Outgoing flow Flow to Mistake States Backtracking flow Mistake States and Transi3ons: 12

13. Reported Metrics Signs for poten3al usability problems: -‐ Too many backtracking -‐ Par0cipants cannot complete one step -‐ Low correct ﬂow ra0o 13

14. Evaluation Usability Problems idenFﬁed by Event Logging Tool: * Numbers in parenthesis are problems idenFﬁed by Laboratory-‐ based Usability tesFng method: -‐  Good at iden3fying cri3cal (major and catastrophe) usability problems. -‐  Not good at iden3fying cosme3c usability problems. 14

15. Challenges •  More precise analysis model with semantics •  Integration with context •  Inspection before deployment 15

PhoneCom2011 panel - Guanling Chen

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