This paper focuses on investigating undesirable student behaviours in classroom management at the stage of middle schools of Turkey and proposed solutions within the context of Reality Therapy. The specific objectives of the research focuses on identifying the application of Reality Therapy Discipline Model to solve problems in the class, according to teachers' points of views and the researcher's observations. The study relies on the method of case study and the phenomenological approach, which centers on the noted phenomenon, as well as the in-depth information that is not yet known (Yildirim & Simsek, 2013). The study group of the research consisted of 20 branch teachers who were voluntarily chosen and had worked in the middle schools of Ministry of National Education in Turkey, within the school year of 2019-2020. Before the data were collected, the participants were informed about the content of the research and data confidentiality and voluntary consent forms were signed. In this research, the teacher information form was joined to the interview form, the teacher interview form, the observation form, and the research diary, which were used as the instruments to collect the data. Content analysis method was used to analyse the data collected by means of the interviews with teachers, the research diary, and the observations made in two teachers' classroom environment. Expert opinions guided the transition from the draft to the final version of the interview form used in the study. A pilot interview was made with two teachers, who were not in the study group. The findings obtained indicated that the teachers did not accurately use all the steps of Reality Therapy Model to solve the discipline problems. It was determined that they used some steps of the model. The teachers first used the solution that should be applied in the end according to Reality Therapy Model, and those who chose to talk to the students at first initiated other steps before they developed a plan to solve serious problems, whose solutions needed to be made outside the class. In accordance with findings, to contribute to the field, some suggestions have been made.