ABSTRACT
The paper reports on a study that examined the use of Project-Based Learning (PBL)
increasing students’ vocabulary knowledge. The study was conducted in some private
institutes for some Iranian junior high school students. After applying the approach and
conducting post-test, significant differences were observed. This approach can be used as a
training tool to help acquire vocabulary. The Project-Based Learning (PBL) approach in
education often generates justifiable enthusiasm among those who have become frustrated
with the limitations of traditional lecture-based education. In recent years, it has been widely
acknowledged that classes designed by utilizing Project-Based Learning (PBL) are effective
in enhancing the problem-solving ability of students. In PBL-based classes, students worked
in groups and tried to apply their knowledge to solve the problems by themselves; therefore,
such classes were effective in improving students’ vocabulary knowledge and communication
abilities.