Introduction and Purpose Today, with the advancement of technology, the diversification of methods used in nursing education is an important development. Video-assisted education stands out among these developments. Video-assisted education is considered an effective tool for improving nurses' clinical skills and ensuring their correct application. Nasogastric tube (NGT) insertion skill is a basic ability in nursing practice and its correct performance is of vital importance. However, acquisition and maintenance of this skill may not be sufficient by traditional education methods alone. In this context, video-assisted self-assessment may play an important role in the assessment of NGS insertion knowledge and skill in nursing education. The aim of this study is to evaluate the effect of video-assisted self-assessment on nasogastric tube insertion knowledge and skill in nursing clinical skills education. Hypotheses The use of video-assisted self-assessment method increases students' knowledge level regarding nasogastric tube insertion practice. The use of video-assisted self-assessment method increases students' skill level regarding nasogastric tube insertion practice. Material and Method This research was designed as a randomized controlled pretest-posttest experimental design. Since the study is a randomized controlled trial, the Clinical Trials ID will be obtained after the ethics committee is approved. The Intervention Description and Replication Template (TIDier) checklist and guide were used to define the intervention. "FR.1 Personal Information Form", "FR.2 Nasogastric Tube Placement Knowledge Test" and "FR.3 Nasogastric Tube Placement Skills Checklist" will be used to collect data. Data Collection Tools FR.1 Personal Information Form: It was prepared by the researchers and consists of 15 questions questioning demographic characteristics such as age, gender, and socioeconomic level. FR.2 Nasogastric Tube Placement Knowledge Test: A knowledge test was created in line with the scope and objectives of the NGS placement theoretical course content prepared in line with the literature. It consists of 20 multiple-choice questions with five options. The lowest score possible from this test is 0 and the highest is 20. FR.3 Nasogastric Tube Placement Skill Checklist: It includes the materials to be used in the NGS placement application and the steps to ensure that the application is carried out correctly. It consists of 51 steps. Each procedure step will be evaluated and scored as "Correct Application", "Incorrect Application" and "Not Observed". Data Collection Data will be collected in the Fundamentals of Nursing course in the spring semester of the 2023-2024 academic year. In the first stage, all students will be informed about the research and their consent will be obtained. Students who agree to participate in the research will fill out the "FR.1 Personal Information Form" in the classroom. Then, all students will be given the "FR.2 Knowledge Test for Nasogastric Tube Placement" as a pretest. Experimental and Control Groups Experimental Group: Students will be shown the NGS placement application in a laboratory environment and will be applied on a model. All procedures will be recorded with a fixed camera and their own video recordings will be sent to the students. Students will be asked to watch the videos and evaluate them according to the application skill list. Control Group: Students will be shown the NGS placement application in a laboratory environment and will be applied on a model. All procedures will be recorded with a fixed camera, but the recordings will not be shared with the students. Post-Test and OSCE The "FR.2 Nasogastric Tube Placement Knowledge Test" will be applied as a post-test to the students in the experimental and control groups one week after the completion of theoretical training and laboratory practice. At the same time, the OSCE exam will be performed in accordance with the FR.3 checklist for both groups. Data Evaluation SPSS 23.0 package program will be used to evaluate the data obtained from the research. The suitability of the variables for normal distribution will be examined with visual and analytical methods. Independent groups t-test and chi-square test will be used for comparisons of the control and intervention groups. Paired t test or Wilcoxon test will be used to compare the scale scores before and after the application in the intervention group. The relationships between the variables will be evaluated with Pearson or Spearman correlation analysis. The level of statistical significance will be accepted as p\<0.05. Difficulties and Limitations of the Study This study was conducted only with first-year nursing students studying at the faculty of nursing of a university. Additionally, the possibility of interaction between the students in the intervention and control groups increases the limitations of the study. Ethical Principles of the Study Before starting the research, approval will be obtained from the Ethics Committee Presidency. In addition, written permission will be obtained from the university where the research will be conducted. During the collection of research data, individuals will be informed about the research and the "Informed Consent" principle will be fulfilled, stating that they are free to participate or not in the research, the "Respect for Autonomy" principle, and stating that the participants' information will be kept confidential, and written and verbal consent will be obtained. Since individual rights must be protected in the research, the Helsinki Declaration of Human Rights will be adhered to.