The purpose of this study is to determine the purpose, scope, research model, data collection tool, data analysis method and sample size of the studies on bilingualism. According to the general screening model, the documents collected were analyzed. In the first step, in order to determine the focus and scope, the objectives of the sample studies were examined based on the descriptive analysis. In the second step, research model, data collection tools, data analysis methods, and the number of participants of the studies were examined. Thus, the scope of the studies was determined. For this purpose, research models, data collection tools, data analysis methods and the number of participants were examined. Based on the conclusions of this part, it was determined that the experimental and descriptive models were frequently used in sample the studies.