Question Answering with LCC's CHAUCER at TREC 2006

CHAUCER is a Q/A system developed for (a) combin- ing several strategies for modeling the target of a series of questions and (b) optimizing the extraction of an- swers. Targets were modeled by (1) topic signatures; (2) semantic types; (3) lexico-semantic patterns; (4) frame dependencies; and (5) predictive questions. Sev- eral strategies for answer extraction were also tried. The best-performing strategy was based on the use of textual entailment.