SP500215 Appendix B: System Features Appendix National Institute of Standards and Technology D. K. Harman HL SEARCHING is a batch routing system9 with no pre-indexing. The system processes about 1,000 texts per minute. querying program processed all 50 topics (either routing or adhoc) in parallel on four machines. Processing took approximately four hours. adhoc, need to compare a query to ALL documents, soit takes about 10 minutes. For routing, we compare each new document to each of the 50 routing flit `it 0.1 seconds. iodified vector space model. Fewer dimensions than typical vector space - e.g., 200 dimensional real valued term and doc vectors. .60 per query without soft-boolean (combine 2 methods). 200 per query with soft-boolean (combine 3 methods).