This study investigated whether task complexity influences second language (L2) writers’ fluency, pausing, and revision behaviors and the cognitive processes underlying these behaviors; whether task complexity affects linguistic complexity of written output; and whether relationships between writing behaviors and linguistic complexity are moderated by task complexity. Participants were 73 advanced L2 writers, who completed simple or complex essay tasks. Task complexity was operationalized as the absence versus presence of content support. Participants’ writing behaviors were recorded via keystroke logging software. Four writers, drawn from groups performing simple and complex tasks, additionally engaged in stimulated recall. Content support was found to lead to less pausing, more revision, and increased linguistic complexity. When content support was absent, more frequent pauses and revisions were associated with less sophisticated lexis. These results, combined with stimulated recall comments, suggest that content support likely reduced processing burden on planning processes, facilitating attention to linguistic encoding. Open Practices This article has been awarded an Open Materials badge. All materials are publicly accessible in the IRIS digital repository at http://www.iris-database.org. Learn more about the Open Practices badges from the Center for Open Science: https://osf.io/tvyxz/wiki.

This study examined whether the observed effectiveness of recasts is influenced by the type of outcome measure used and whether different aspects of working memory are differentially associated with learners' performance on the various outcome measures. The participants were 90 learners of English as a foreign language, who were randomly assigned to a recast, a nonrecast, and a control group. A pretest-posttest-delayed posttest design was employed to detect any improvement in the learners' knowledge of one usage of the English past progressive construction. Many-facet Rasch measurement and correlational analyses yielded two main findings. First, recasts generated the greatest gains on an oral production test, lesser gains on a written production test, and the least gains on a written grammaticality judgment test. Second, in the recast group, participants with higher reading spans achieved more development on the written tests, while those with higher digit and nonword spans showed greater improvement on the oral test. For the nonrecast group, no association was found between the working memory and developmental measures.

This study explored the usefulness of dual-task methodology, selfratings, and expert judgments in assessing task-generated cognitive demands as a way to provide validity evidence for manipulations of task complexity. The participants were 96 students and 61 English as a second language (ESL) teachers. The students, 48 English native speakers and 48 ESL speakers, carried out simple and complex versions of three oral tasks-a picture narrative, a map task, and a decision-making task.Half of the students completed the tasks under a dual-task condition. The remaining half performed the tasks under a single-task condition without a secondary task. Participants in the single condition were asked to rate their perceived mental effort and task diffi culty. The ESL teachers provided expert judgments of anticipated mental effort and task diffi culty along with explanations for their ratings via an online questionnaire. As predicted, the more complex task versions were found and judged to pose greater cognitive effort on most measures.

Motivated by cognitive-interactionist frameworks for task-based learning, this study explores whether task complexity affects the extent to which learners focus on form-meaning connections during task-based work in a classroom setting, and whether this relationship is modulated by 3 individual difference factors-linguistic self-confidence, anxiety, and self-perceived communicative competence. Forty-three English as a second language learners from 6 intact classes worked in self-selected groups during their normal English classes. Each group performed 2 versions of the same argumentative task-a simple version and a complex version. The topics of the discussions were comparable, and the sequence of the tasks was counterbalanced. Twentythree hours of audio-and videotaped data were collected and coded in terms of global and specific measures of speech production and various interactional features hypothesized to facilitate attention to second language constructions. Self-report questionnaires were employed to determine the mediating effects of the individual difference variables. Quantitative analyses revealed a few significant trends. One such trend is that participants demonstrated lower syntactic complexity but greater accuracy and lexical diversity when task complexity was increased. In addition, the more complex task proved more effective in inducing the use of specific, developmentally advanced constructions and in promoting interaction-driven language learning opportunities. However, no significant effects were observed for individual differences.