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Open-Domain Question-Answering
Foundations and Trends® in
Information Retrieval
Volume 1 Issue 2
DOI: 10.1561/1500000001
Open-Domain Question-Answering
John Prager
IBM T.J. Watson Research Center, 1S-D56, P.O. Box 704, Yorktown Heights, NY 10598, USA, jprager@us.ibm.com
SUGGESTED CITATION:
John
Prager
(2006)
"Open-Domain Question–Answering",
Foundations and Trends® in
Information Retrieval: Vol. 1: No 2, pp 91-231.
http:/dx.doi.org/10.1561/1500000001
Abstract
The top-performing Question-Answering (QA) systems have been of two types: consistent, solid, well-established and multi-faceted
systems that do well year after year, and ones that come out of nowhere employing totally innovative approaches and which
out-perform almost everybody else. This article examines both types of system in depth. We establish what a “typical” QA-system
looks like, and cover the commonly used approaches by the component modules. Understanding this will enable any proficient
system developer to build his own QA-system. Fortunately there are many components available for free from their developers
to make this a reasonable expectation for a graduate-level project. We also look at particular systems that have performed
well and which employ interesting and innovative approaches.
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