Harezmi Education Model (HEM), one of the applications based on an interdisciplinary approach, is an education model that allows students to develop 21st century skills such as algorithmic thinking, problem solving, and working in a team (MEB, 2021). Since 2016, HEM is an education model that integrates computer and science with social sciences, uses programming and teaching tools effectively, produces by having fun with robotics and game design, and constantly updates itself. In this research, it was tried to determine the opinions of students in secondary schools that implement HEM regarding HEM practices. The research using Mixed Research Method and Exploratory Sequential Design was carried out in three stages. The opinions of 9 students were consulted through the semi-structured student interview form prepared in the first stage, and the qualitative dimension of the research was carried out. Then, using the qualitative findings obtained, a scale was developed to determine student opinions regarding HEM practices. In the last stage, quantitative findings were obtained by applying the scale to 308 secondary school students, and based on this finding, it was tried to determine whether the qualitative findings were generalizable. As a result of the research, it was determined that the students' opinions about PEC applications were quite positive, and while their opinions were similar in terms of gender, their opinions differed in terms of school type and grade level. Students stated that although HEM applications had some shortcomings, they benefited from this training and were satisfied with the training they received. In their suggestions regarding HEM practices, students mostly stated that their scope, duration and comprehensiveness should be increased. In addition to these suggestions, some remedial suggestions were presented in the research.