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.

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