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Measuring maturityRichard Hudsonlast changed 1 February 2008 Bibliographical informationThis is a draft chapter, written in September 2007, for the forthcoming 'SAGE Handbook of Writing Development', edited by Roger Beard, Debra Myhill, Martin Nystrand and Jeni Riley. AbstractThe chapter reviews the anglophone research literature on the 'formal' differences (identifiable in terms of grammatical or lexical patterns) between relatively mature and relatively immature writing (where maturity can be defined in terms of independent characteristics including the writer's age and examiners' gradings of quality). The measures involve aspects of vocabulary as well as both broad and detailed patterns of syntax. In vocabulary, maturity correlates not only with familiar measures of lexical diversity, sophistication and density, but also with 'nouniness' (not to be confused with 'nominality'), the proportion of word tokens that are nouns. In syntax, it correlates not only with broad measures such as T-unit length and subordination (versus coordination), but also with the use of more specific patterns such as apposition. At present these measures are empirically grounded but have no satisfactory theoretical explanation, but we can be sure that the eventual explanation will involve mental growth in at least two areas: working memory capacity and knowledge of language. |