The Center for Satellite and Hybrid Communication Networks is a NASA-sponsored Commercial Space Center also supported by the Department of Defense (DOD), industry, the State of Maryland, the University of Maryland and the Institute for Systems Research. This document is a technical report in the CSHCN series originating at the University of Maryland. Web site http://www.isr.umd.edu/CSHCN/ TECHNICAL RESEARCH REPORT Browsing Hierarchical Data with Multi-Level Dynamic Queries and Pruning by H.P. Kumar, C. Plaisant, B. Shneiderman CSHCN T.R. 95-10 (ISR T.R. 95-53)