In project-based learning (PBL), tasks are assigned to students and they create teams for group works (Cadaba, etal. 2009). The task can be in investigation or research on a specific issue. Students collaborate with each other to support collectivism. Students try to apply critical thinking principals by asking and refining questions, debating ideas, making predictions, collecting and analyzing data, drawing conclusions, and communicating their findings to others. PBL is a powerful teaching strategy that would enhance student motivation and promote self-directed learning (Blumenfeld et al., 1991). Collaborative learning is a situation in which two or more people learn or attempt to learn something together (Dillenbourg, et al., 1999). Duty is configured that encourage collaborative in teams of four students.