@article {16194,
	title = {Browsing hierarchical data with multi-level dynamic queries and pruning},
	journal = {International Journal of Human-Computer Studies},
	volume = {46},
	year = {1997},
	month = {1997/01//},
	pages = {103 - 124},
	abstract = {Users often must browse hierarchies with thousands of nodes in search of those that best match their information needs. ThePDQ Tree-browser(Pruning with Dynamic Queries) visualization tool was specified, designed and developed for this purpose. This tool presents trees in two tightly-coupled views, one a detailed view and the other an overview. Users can use dynamic queries, a method for rapidly filtering data, to filter nodes at each level of the tree. The dynamic query panels are user-customizable. Sub-trees of unselected nodes are pruned out, leading to compact views of relevant nodes. Usability testing of the PDQ Tree-browser, done with eight subjects, helped assess strengths and identify possible improvements. The PDQ Tree-browser was used in Network Management (600 nodes) and UniversityFinder (1100 nodes) applications. A controlled experiment, with 24 subjects, showed that pruning significantly improved performance speed and subjective user satisfaction. Future research directions are suggested.},
	isbn = {1071-5819},
	doi = {10.1006/ijhc.1996.0085},
	url = {http://www.sciencedirect.com/science/article/pii/S1071581996900853},
	author = {Kumar,Harsha P. and Plaisant, Catherine and Shneiderman, Ben}
}
