For the Introduction to Environmental Engineering course, PBL component constitutes to approximately 30% from the total course assessment. Team working is applied in the PBL approach. To organise a lesson in a relatively large class of approximately 100 students, it is rather a difficult task for the instructor to interact or ask questions to each student individually during the lecture. Thus, discussions among the students and lecturers were made in a group during the PBL project meetings. In this course, students were divided into 3 to 5 students for each group.