SP500207 Application of the Automatic Message Router to the TIPSTER Collection chapter R. Jones S. Leung D.L. Pape National Institute of Standards and Technology Donna K. Harman Centre for Electronic Document Reeearch TREC Routing Experiments CPGHC and CPGCN Svstems Summarv and Timing I Construction of Indexes The software does not invert the text. It inverts the queries (or filters) and passes the text through the combined index formed from the queries. Query Construction D Automatically Built Queries (Routing) 1 Concept field used 2 Time to build query <5 seconds 3 (a) Terms selected from topic (b) Terms weighted with weights based on terms from documents with relevance judgements, and dynamically modified through the training set and the test set. c) Phrases extracted from topics j) Automatic addition of Boolean connectors and proximity operators from topics. E Manually constructed queries (routing) 1 All topic fields used 2 Average time to build query 30 minutes 3 Query builder system expert 4 Data used to build query from topic 5 The creation of the query uses Boolean operators, and proximity operators. 249