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'''Natural Language User Interfaces''' (LUI) are a type of [[User interface|computer human interface]] where linguistic phenomena such as verbs, phrases and clauses act as UI controls for creating, selecting and modifying data in software applications.
In [[interface design]] natural language interfaces are sought after for their speed and ease of use, but most suffer the challenges to understanding wide varieties of ambiguous input.<ref>Hill, I. (1983). "Natural language versus computer language." In M. Sime and M. Coombs (Eds.) Designing for Human-Computer Communication. Academic Press.
Natural language interfaces are an active area of study in the field of [[natural language processing]] and [[Computational linguistics]].
An intuitive general Natural language interface is one of the active goals of the [[Semantic Web]].
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A natural language search engine would in theory find targeted answers to user questions (as opposed to [[keyword search]]). For example, when confronted with a question of the form 'which [[United States|U.S.]] state has the highest [[income tax]]?', conventional search engines ignore the question and instead do a search on the [[Keyword (Internet search)|keywords]] 'state, income and tax'. Natural language search, on the other hand, attempts to use natural language processing to understand the nature of the question and then to search and return a subset of the web that contains the answer to the question. If it works, results would have a higher relevance than results from a keyword search engine.
From a commercial standpoint, advertising on the results page could also be more relevant and could have a higher revenue potential than that of keyword search engines.{{
==History==
Prototype Nl interfaces had already appeared in the late sixties and early seventies.
I. Androutsopoulos,
G.D. Ritchie,
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* [[Ibm]]’s '''Languageaccess'''
* '''Q&A''' from [[Symantec]].
* '''Datatalker''' from Natural Language Inc.
* '''Loqui''' from [[Bim]].
* '''English Wizard''' from [[Linguistic Technology Corporation]].
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===Ubiquity===
{{main|Ubiquity (Firefox)}}
Ubiquity, an [[add-on (Mozilla)|add-on]] for [[Mozilla Firefox]], is a collection of quick and easy
===Wolfram Alpha===
{{main|Wolfram Alpha}}
Wolfram Alpha is an online service that answers factual queries directly by computing the answer from structured data, rather than providing a list of documents or web pages that might contain the answer as a [[search engine]] would.<ref>{{cite news |url=http://www.guardian.co.uk/technology/2009/mar/09/search-engine-google |title=British search engine 'could rival Google' |last=Johnson |first=Bobbie |date=2009-03-09 |work=[[The Guardian]] |accessdate=2009-03-09}}</ref> It was announced in March 2009 by [[Stephen Wolfram]], and was released to the public on May 15, 2009.<ref name="launch date">{{cite web|url=http://blog.wolframalpha.com/2009/05/08/so-much-for-a-quiet-launch/ |title=So Much for A Quiet Launch |publisher=Wolfram Alpha Blog |date=2009-05-08 |accessdate=2009-10-20}}</ref>
===Siri===
{{main|Siri Personal Assistant}}
Siri is a [[personal assistant]] application for the [[iPhone OS]]. The application uses [[natural language processing]] to answer questions and make recommendations. The iPhone app is the first public product by its makers, who are focused on [[artificial intelligence]] applications.
Siri's marketing claims include that Siri adapts to the user's individual preferences over time and personalizes results, as well as accomplishing tasks such as making dinner reservations while trying to catch a cab.
===Others===
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{{Internet search}}
{{Computable knowledge}}
{{DEFAULTSORT:Natural Language User Interface}}
[[Category:User interface]]
[[Category:Artificial intelligence applications]]
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