Conference article

An analysis of a French as a Foreign Language Corpus for Readability Assessment

Thomas Francois
IL&C, Cental, Universitå catholique de Louvain, Belgium

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Published in: Proceedings of the third workshop on NLP for computer-assisted language learning at SLTC 2014, Uppsala University

Linköping Electronic Conference Proceedings 107:2, p. 13–32

NEALT Proceedings Series 22:2, p. 13–32

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Published: 2014-11-11

ISBN: 978-91-7519-175-1

ISSN: 1650-3686 (print), 1650-3740 (online)

Abstract

Readability aims to assess the difficulty of texts based on various linguistic predictors (the lexicon used, the complexity of sentences, the coherence of the text, etc.). It is an active field that has applications in a large number of NLP domains, among which machine translation, text simplification, text summarisation, or CALL (Computer-Assisted Language Learning). For CALL, readability tools could be used to help the retrieval of educational materials or to make CALL platforms more adaptive. However, developing a readability formula is a costly process that requires a large amount of texts annotated in terms of difficulty. The current mainstream method to gather such a large corpus of annotated texts is to get them from educational resources such as textbooks or simplified readers. In this paper, we describe the collection process of an annotated corpus of French as a foreign language texts with the purpose of training a readability model. We follow the mainstream approach, getting the texts from textbooks, but we are concerned with the limitations of such “annotation” approach, in particular, as regards the homogeneity of the difficulty annotations across textbook series. Their reliability is assessed using both a qualitative and a quantitative analysis. It appears that, for some educational levels, the hypothesis of the annotation homogeneity must be rejected. Various reasons for such findings are discussed and the paper concludes with recommandations for future similar attempts.

Keywords

Readability; FFL; corpus collect; reliability of difficulty annotations

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