What al+c the benefits of ttsing Natural [~anguagc (;cneratio,t in an industrial apl+lication? We have attempt t<) answer part (}f this qttcsti{}n with at descripti(}n of an assessment {}f three techniques for producing multiscntcntial text: sentiatutomatic fill-in-lhc-blank interfacing, automalic linguistic-and-tcmphltes hybrid generation, and hunlall writing. This asscssIllol]l used a black b(}x motlmdology, with ain independetlt blindtested jury that gave difforent quality levels in relation to a sot o1' criteria. The texts used for tile assessliicnt wcfc business reply letters.

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The AlethGen tool has been used to build a system for automatically generating replies to complaints, for a European mail-order company. In the current version, letters are generated in French. AlethGen consists of several modules: the text deep structure planner (or conceptual planner), the text surface structure planner (or rhetorical planner), the computation of pronouns and quantifiers, and the linguistic generator proper (globally inspired by the Meaning-Text Theory) which determines the concrete realization of sentences. The paper mainly describes AlethGen's conceptual and rhetorical planners and focuses on the knowledge they use and produce.

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