Review of thesis studies written on geometric thinking in Türkiye

This study aims to obtain general information about the trends of master's and doctoral thesis studies on geometric thinking in Türkiye. In the study, document review was used within the scope of qualitative research. The data sources of the study consist of 126 thesis registered in the National Thesis Center Database of the Council of Higher Education and prepared on geometric thinking in Türkiye between 2000 and 2023. Thesis were examined according to the prepared thesis examination form. Microsoft Excel program was used to code the research data and descriptive statistics such as frequency and percentage were used. Descriptive analysis and content analysis were used to analyze the data obtained. When the findings obtained at the end of the study were examined, it was seen that the van Hiele theory of geometric thinking was used in the majority of thesis prepared on geometric thinking. It turns out that the most researched subject area is success. It was concluded that the studies were mainly carried out at the master's level. It has been determined that the distribution of thesis over the years has generally increased in recent years, although not regularly. It was observed that the publication languages of the studies were predominantly Turkish. It was revealed that most thesis studies were prepared at Dokuz Eylül University and mostly in the Department of Primary Education. It has been observed that thesis writers generally consist of women writers. It was concluded that faculty members with the title of Associate Professor Doctors mostly advised the studies. It has been observed that quantitative research methods are used more in master's level thesis studies, and mixed research methods are used more in doctoral thesis studies. Experimental and quasi-experimental designs were mostly used in thesis. More studies have been conducted with secondary school students. It was concluded that studies conducted with small sample groups were predominant and studies were conducted with groups in the range of 0-100 at most. It has been observed that tests are frequently used as data collection tools. It was concluded that the t-test, one of the types of quantitative data analysis, was most frequently used in the analysis of data in thesis. In the distribution of keyword themes, it was seen that the van Hiele code was used most in thesis. According to the results of the thesis, it has been seen that different learning environments are effective in increasing students' geometric thinking levels and geometric habits of the mind. It is thought that the results of the research will guide researchers who will study geometric thinking and that the increase in studies on different geometric thinking theories will contribute to the literature.