Abstract
Task-based PBL is a education method based on the active learning. We have introduced a task-based PBL approach to a civil engineering education in our college since several years ago. The education gave generally good performances, but occasionally some problems occured. Therefore, our PBL program has been improved to prevent these problems from occuring. As the culmination, we have developed a original task-based PBL program by incorporating KJ method and peer assessments based on cooperative learning. The program leads our students to discover various subjects through the cooperative self-instructions, without leading by excellent tutors. This paper shows the outline and the performances of our PBL program.