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L2 Developmental Measures from a Dynamic Perspective

Published online by Cambridge University Press:  29 December 2020

Bert Le Bruyn
Affiliation:
UIL-OTS, Utrecht University
Magali Paquot
Affiliation:
FNRS – Centre for English Corpus Linguistics, UCLouvain
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Summary

An important objective of research in Second Language Acquisition has been to find a simple and reliable way to quantify second language use. Corpora have provided a crucial source of information for these studies. In spite of many attempts to determine an optimal “yardstick” to measure the quality of second language use, particularly lexical complexity and syntactic complexity, a reliable and widely applicable instrument has not yet been determined. The difficulty in finding a suitable instrument can be accounted for in a complex dynamic systems theory (CDST) approach to second language development. An important starting point of this approach is that every next step in time “is the emergent product of context and history, and no component has causal priority” (Thelen 2005, p. 271). In this paper we illustrate this by using a dense longitudinal corpus of the development of 22 highly similar L2 learners, consisting of 23 weekly measurements. The analysis of these data show convincingly that L2 development is a highly individually owned and nonlinear process. While complexity yardsticks (like MLTU and Guiraud) may seem functional from a group perspective, their application to individual learners is very limited.

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