This study aims to investigate how third-year English majors, perceived the applicationof the Six Thinking Hats model (Bono, 1992) in their 10-week presentation skills class ata non-public university in Vietnam. This action research aims to determine if the students’critical thinking could be improved while class objectives are achieved. A questionnairesurvey with 29 students and a group discussion were used as the main data collectioninstruments to gain insight into the effectiveness of this action research. The findingsinclude the perceived improvement of the observed 21st-century skills among studentsand confidence in presentation. Implications and recommendations for further studies areprovided accordingly