The influence of task complexity and task modality on learners' topic and turn management

Peer interaction is examined as an important indicator of performance in task-based language learning. However, little research has explored learners' interactional competence under the influences of task factors. This study investigates the effects of task complexity and task modality on learners' interactional competence in terms of topic management and turn management. Four tasks were designed - written-simple, written-complex, oral-simple, and oral-complex - and 40 Chinese EFL learners completed them in counterbalanced sequences. The results showed the significant influences of task complexity and task modality on learners' topic and turn management. Task modality and complexity interactively influenced learners when they were expanding on topics in the role of the current speaker. Considering the cognitive demands of increasing complexity and differences between the two modalities, this paper discusses the implications of the findings for developing L2 interactional competence in speech- and text-based interactions.