Manas Tungare, Pardha S. Pyla, Manuel Pérez-Quiñones; Multiple User Interfaces: Why Consistency is Not Everything, and Seamless Task Migration is Key.; Proceedings of the CHI 2006 Workshop on The Many Faces of Consistency in Cross-Platform Design..

1. the many faces of
consistency

2. Why Consistency is Not Everything,
and Seamless Task Migration is Key
• Manas Tungare
• Pardha S. Pyla
• Manuel Pérez-Quiñones

3. Consistency
• Data
• Functionality
• Interaction ● also,
• Behavioral ● Task Disconnects
• Context ● Seamless Task Migration
• Definitions? ● A brief introduction

4. Examples
• Features, not products Consistency
• Certain forms of ? Data
consistency present ? Functionality
• Others, absent ? Interaction
• What makes it good?
? Behavioral
? Context
• ... Or bad?

5. iTunes + iPod
• iPod Shuffle
• Podcasts
Consistency
✔ Data
Functionality
✘ Interaction
Behavioral
Context

6. Address book
• Search / browse
• Large type vs. ‘Call’
Consistency
✔ Data
Functionality
✘ Interaction
Behavioral
Context

7. Calendar
• Cellphone UI
• Voice access
Consistency
✘ Data
✔ Functionality
✘ Interaction
Behavioral
Context

8. Alarms
• Chaos
Rrrrrrrrrring!!!
• Support for Task
Migration?
Consistency
* Data
Functionality
✘ Interaction
✔ Behavioral
Context

9. Maintaining context
• Resume playback
• Resume editing
(e.g. vi)
Consistency
✔ Data
✘ Functionality
✘ Interaction
Behavioral
✔ Context

10. Task Disconnects
• The break in continuity that occurs due to
the extra actions outside the task at hand
that are necessary when a user attempts to
accomplish a task using more than one
device.

11. Design Issues
• Holistic Interaction Design
• ... for an ecosystem of devices
• Task & data partitioning
• Minimize planning activity & cognitive effort

12. Conclusion
Seamless Task Migration
as a higher goal than consistency
for successful
Multiple User Interfaces

13. Questions & Discussion
?
?