Vocabulary and grammar are two significant components of English which learners often find challenging in their process of learning English as a foreign language (EFL). Therefore, finding the best way to teach grammar and vocabulary has always been a controversial issue among English teachers and researchers. The present study is an attempt to investigate the effect of dictogloss (DG) task, as one of the focus on form techniques, on EFL learners’ vocabulary versus grammar development. To this end, a quasi-experimental design was utilized to examine the effectiveness of the treatment. In this design, two classes were chosen, one as the experimental group (n=20) and the other as the control group (n=20). The participants were 40 female learners of English as a foreign language at intermediate level. In the experimental group the selected grammatical structures and vocabulary were taught using the DG technique, while in the control group the traditional method of teaching, present-practice-produce was used. The results gained from comparing pretest and posttest scores indicate that, although the experimental group outperformed the control group in learning vocabulary, there was no statistically significant difference between the experimental and control group regarding grammar scores. Therefore, it can be concluded that using DG task was more effective on vocabulary learning of learners than grammar development. The findings of this study will be of help for both English teachers and learners regarding finding the best method of teaching and learning English grammar and vocabulary.
