Abstract
This study reveals the impact of using parallel corpora on EFL students' writing, and how students perceive it. Female undergraduates (n=46) in an EFL writing course in Saudi Arabia were divided randomly into experimental and control groups taught by the same instructor, using the same materials. Students in the experimental group were introduced to three parallel corpora and encouraged to use them in their writing. Tests at the beginning of the semester showed no difference in English proficiency or writing ability between groups. Over the semester, students in both groups also wrote 5 writing assignments and took three writing exams. To examine students' perceptions of parallel corpora, students in the experimental group were asked to write a self-evaluation report and answer an evaluation questionnaire. Quantitative and qualitative analysis showed significant improvement in their writing but no significant difference between groups. However, students' perception of parallel corpora was generally positive.