© 2022, Ozgen Korkmaz. All rights reserved.Data usage-related reforms lead schools to different practices in terms of management. The conceptualization of data usage and data-based management will ensure that robust steps are taken for the future in terms of reforms made or to be made in the name of education. In this direction, this study is developed as a qualitative case study to determine the opinions of school administrators for data-based management on a school basis. The working group consists of 12 administrators, seven of whom are women and five of whom are men, who work in private and public schools. Purposive sampling method was used to determine the participants. Data from the working group were collected through the semi-structured interview form and themes were created by analyzing in NVino 11. In line with the established themes, the opinions of the administrators were also evaluated. According to the research findings, administrators mostly use data on “e-Okul” and “MEBBIS” modules. Administrators use the said data in decision-making processes, to meet the demands of senior management units, to work with stakeholders, to increase student success. While the administrators stated that there is not enough support or software products to use the data more effectively in the management process, they stated that there is a need for a series of trainings and that these trainings should be in the form of hands-on workshops. They also stated that there should be auxiliary personnel and support services for data analysis. Administrators who reported their problems with time management in accessing data stated that they were not proficient in data analysis and had problems with the motivation, quality, and workload of the personnel.