The Impact of Task Complexity along Single Task Dimension on Iranian EFL Learners' Writing Production

Abstract

This study was designed to explore the manipulation of cognitive task complexity along +/- single task dimension (a resource dispersing dimension in Robinson’s triadic framework) on the Iranian EFL learners’ writing production in terms of accuracy, fluency, lexical complexity, and syntactic complexity, and put two different views (Skehan’s [1998] limited attentional capacity model and Robinson’s [2005] cognition hypothesis) into test in the Iranian context. Based on the results of the writing test of TOFEL (2004), 48 learners were selected and assigned into two groups, simple task group (STG, n=24) and complex task group (CTG, n=24). The participants in the STG were given an eight-frame picture arranged in the correct sequence (+ single task). The participants in the CTG were given all the eight frames in scrambled order. These participants were required to order the frames in the right sequence first (- single task). Four independent sample t-tests were run. The results indicated that the participants’ output in the complex task were significantly more fluent, more lexically and structurally complex. However, their performance on the accuracy measure decreased in the complex task. Based on the findings, at least in the Iranian context, Skehan’s (1998) predictions are more convincing.