Collaborative writing has gained interest in the last decade; however, as stated by Shin, Lidster and Sabraw (2016) more research is required to delve into various aspects of this multifarious class activity. This true experimental research examined the effect of writing collaboratively on task achievement of Iranian EFL learners in writing. Oxford Placement Test was given to 60 language learners in the city of Kashmar, Iran,  as the test of homogeneity. Considering +/-1 standard deviation of the mean score, 40 learners were chosen to pursue the purpose of the study. These learners formed an experimental group and a control group with 20 participants in each. Collaborative writing was implemented in the experimental group and individual writing was used in the comparison group. The participants in the experimental group were later interviewed and their perception toward collaborative writing was investigated. The findings of the study through t-test revealed that the experimental group participants outperformed the ones in the control group in terms of task achievement. In addition, the results of the semi-structured interview through thematic analysis revealed that most participants found collaborative writing effective in terms of motivation, peer feedback, comprehensive view over the topic, changing ineffective writing habits, and vocabulary learning; though peer authority and teacher authority were considered as inhibiting factors. Pedagogical implications are discussed.

Incidental vocabulary learning is one of the most significant sources of learning vocabulary for language learners )Laufer  & Hulstjin, 2001). This study endeavored to investigate the effect of using online collaborative tasks on incidental vocabulary learning of impulsive vs. reflective Iranian EFL learners. To this end, Nelson vocabulary proficiency test was administered to 100 Iranian EFL learners as the homogeneity test and the pretest. Using random sampling procedure, 75 learners were selected as the main participants for this study. Kember, McKay, Sinclair and Wong (2008) reflective thinking questionnaire was administered to these learners, based on which they were distinguished based on their cognitive thinking styles, i.e., impulsivity and reflectivity. The participants were homogenously distributed into 3 main groups (impulsive experimental group, reflective experimental group, and the control group). All participants went through 4 weeks of treatment. Experimental groups were conducted using Telegram software and the control group was conducted in a classroom. The results of t-test after 4 weeks of treatment revealed that reflective learners benefited from online collaborative groups with regard to incidental vocabulary learning. The findings of the study are discussed in light of previous research.

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