Transcript Plaisant , Kumar

LifeLines:Visualizing Personal
Histories
Plaisant, Milash, Rose, Widoff,
Shneiderman
Presented by
Girish Kumar and Rajiv Gandhi
Outline
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Overview + Detail
LifeLines
Example -- Dept. of Juvenile Justice
Related Work
Conclusion and Critique
Favorite Sentence
“An intuitive approach to visualizing histories
is to use graphical time scales.”
Overview + Detail
• Provides multiple views
– overview for orientation
– detailed view for further work
• e.g.- virtual space on the desktop
LifeLines
• Maps histories on graphical time scale
• Overview screen displays multiple facets of
data
• Stories or aspects are lines
• Periods correspond to changes of size or
color along the line
• Discrete events are marked by icons
• Set of buttons gives access to general
information
An Example - Department of
Juvenile Justice (DJJ)
Key Features
• Interrelationships between periods or events
on the lines can be highlighted
• Line thickness indicates the severity of
offence
• Color indicates the depth of penetration in
the system
Benefits of LifeLines
• Users are less likely to miss information
• Facilitates the spotting of anomalies and
trends
• Streamlines access to details
• Tailorable to various applications
Issues
• Representing large amount of information at
overview level
• Efficient space utilization
• Integration with data entry techniques
Browsing Hierarchical Data With MultiLevel Dynamic Queries And Pruning
Kumar, Plaisant, Shneiderman
Key Ideas
• Browse large hierarchies and view it at
different levels
• Dynamic Queries used to filter nodes at
each level of the tree
• Pruning of sub-trees of uninteresting nodes
to get more compact views
PDQ Tree Browser
• Tree structure is visualized in two tightlycoupled views - Overview and Detailed
• User selectable dynamic query panel
• Tree structure changes only when the
current lowest level of the tree is changed
• Pruning is done to eliminate non-matching
subtrees
An Example - The University
Finder
Key Features
• Helps locate interesting parts of large trees
• Tightly coupled overview and detailed
views
• Easy to use interface
Limitations
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Interface fine tuned for tree of depth 5
Manual selection and pruning not supported
Doesn’t support all boolean queries
Does not utilize available space efficiently
Change in layout not animated
Doesn’t support searching upwards in the
tree
Conclusions and Critique
• Time is an effective variable to display
personal histories
• Overview + Detail
– maintain overall context
– navigate data details
• Overview may become cluttered with large
amounts of data
• Need for better space utilization techniques