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The study was designed and implemented with a view to promoting high-school students’ critical thinking ability through the application of project-based learning approach. Therefore, the researcher conducted this study to investigate the activities of PBL that teachers can apply to develop students’ critical thinking and students’ attitudes towards the impacts of such application on their critical thinking. The study followed the action research design with participants were 90 students in two grade 11 English classes in a local province of Vietnam. During nine weeks of the study, students were divided into small groups to work on a tourism brochure-creating project, in which activities to promote critical thinking ability were planned to be incorporated throughout different stages of the project completion. Observation, questionnaire and interview were the instruments employed to collect data for analysis. Findings of the study confirmed that the application of project-based learning approach with various activities aiming at promoting students’ critical thinking had positive impacts on getting students to think more critically and improving their language knowledge and skills. Students also showed their favorable attitudes towards PBL application in English classes.
