en آموزش پزشکی Medical Education پژوهشي اصیل Orginal Research <div style="text-align: justify;"><span style="line-height:2;"><span style="font-size:16px;"><span style="font-family:Times New Roman;"><b>Background & Objective: </b>Providing exceptional attention to cancer patients requires nursing education in the oncology unit. Thus, this study aimed to acquire and improve clinical competency in nursing students through the Mastery Learning approach and compare it with traditional education.<br> <b>Materials & Methods:</b> This study used a mixed-method (exploratory sequential design) approach to develop a clinical competency checklist and evaluate students&#39; skills through Mastery Learning. This research started with a qualitative study and continued with a quantitative one. We developed the checklist using a three-round Delphi method, comprising 41 items based on 7 criteria. An internship program was offered to 20 nursing students in two groups (i.e., Mastery Learning training and traditional training) at the oncology department of Hakim Hospital, Neyshabur, Iran, for one semester. To assess the impact of the intervention on students&#39; anxiety, an Evaluation Apprehension Measure questionnaire was administered to each student before the posttest, followed by a 5-item objective structured clinical examination (OSCE) to assess students&#39; final skills. The competency and anxiety questionnaire was also checked for reliability and validity.<br> <b>Results:</b> <span lang="EN-IN">For the clinical competence checklist, 41 out of 52 items showed more than 80% agreement. The results of the anxiety test demonstrated that students receiving Mastery Learning were moderately anxious, while students undergoing traditional training had high levels of anxiety. The results of the OSCE test showed that the students in the Mastery Learning group had significantly higher scores than their peers in the traditional training group</span>.<br> <b>Conclusion:</b> This study found that Mastery Learning led to a reduction in test anxiety and an increase in clinical competence.<br> <span style="font-family:"Times New Roman",serif"></span></span></span></span></div> Anxiety, Clinical Competency, Deliberate Practice, Mastery Learning, Nursing, Oncology, Traditional Training 1 12 http://edujournal.zums.ac.ir/browse.php?a_code=A-12-1797-2&slc_lang=en&sid=1 Mohsen Masoumian Hosseini masoumian.m@vums.ac.ir 5300319475328460024974 5300319475328460024974 No Department of E-learning in medical science, Smart University of Medical Sciences, Tehran, Iran Fateme Ruhabadi 5300319475328460024975 5300319475328460024975 No Department of Nursing Sabzevar Faculty of Medical Sciences. Khorasan Razavi. Iran Azam Gazerani azamgazeranii@gmail.com 5300319475328460024976 5300319475328460024976 No Department of Nursing, Neyshabur University of Medical Sciences, Neyshabur, Iran Seyedeh Toktam Masoumian Hosseini masoumiant99@gmail.com 5300319475328460024977 5300319475328460024977 No Department of the School of Nursing and Midwifery,Torbat Heydariyeh University of Medical Sciences, Torbat Heydariyeh, Iran Hosnieh Raoufian gazerania1@nums.ac.ir 5300319475328460024978 5300319475328460024978 No Department of the School of Nursing and Midwifery,Torbat Heydariyeh University of Medical Sciences, Torbat Heydariyeh, Iran Vahid Moeini v.moini@yahoo.com 5300319475328460024979 5300319475328460024979 No Department of Operating Room, Neyshabur University of Medical Sciences, Neyshabur, Iran Akram Gazerani akramgazrany@gmail.com 5300319475328460024980 5300319475328460024980 Yes Department of Operating Room, Neyshabur University of Medical Sciences, Neyshabur, Iran