Methods Thirty-six nurse anesthetist students in Academic Year 2015, Department of Anesthesiology, Faculty of Medicine Siriraj Hospital, Mahidol University, volunteered to join the study project without any honorarium. The benefit of taking part in the study was only knowledge and clinical experience gained. The students were informed about the significance of the research under the faculty policy as well as the learning objectives in details. After signing the consent form, they were randomly put into two groups: A (n = 17) and B (n = 19). As designed by the cross-over study, students in group A attended SBL and after 6 weeks, they focused on PBL, and vice versa for group B.