1. Presented by Seth Hettich
Browsing hierarchical data with multi-layer dynamic queries and pruning
Presented by Seth Hettich

2. Goals Enable users to browse hierarchical data
Browse and view the data at all levels
Query nodes in the tree
Hide and expand sub-trees quickly
Provide a high level overview of the data

3. PDQ Tree Features Two coupled views of the data
Customizable dynamic query tools
Dynamic queries at different levels of tree
Pruning sub-trees to save space

4. PDQ Tree UI
Data Display
Query panel
Overview

5. Using the query tool

6. Using the query tool

7. Data Display

8. Active nodes at current level

9. Active nodes at higher levels

10. Pruned nodes

11. PDQ Tree limits Need to tune UI for tree depth
Only three attributes per level for query
Only AND queries
Not the most compact layout
Limited user interactivity (can’t click on nodes)

12. User study Tested three options: 24 subjects, 8 per option
Full-tree
Partially-pruned
Fully-pruned
24 subjects, 8 per option
Timed at tasks, user evaluation

13. User Study: results Fully-pruned was the fastest
Partial pruning was the most popular
Full tree sucked