The main aim of achieving with the reliability generalization is to investigate the variability related to the reliability estimates and to try to characterize the sources of this variability. As part of the research, a reliability generalization study was carried out on the basis of Beck Depression Inventory-II to investigate potential factors contributing to the variability of the reliability of the measurement results and to examine the sources of the measurement error. Within the scope of the study, it was published in English between 2011-2019 and only 40 articles in the type of article were examined. The Kappa coefficient for the coding form was determined to be 0.93 and it was concluded that the measurement results performed for the coding form were valid and reliable. Jamovi and R programs were used in the research. When the test results regarding publication bias are evaluated in a holistic way, it is concluded that there is no publication bias related to the studies included in the research. It was thought that the heterogeneity observed by the researchers may indicate an amount of heterogeneity to be examined and moderator analyzes were performed. As a result of the moderator analysis, it was determined that any of the continuous and categorical moderator variables did not have an explanatory role regarding the variability between the reliability estimates of the inventory. In order to carry out qualified RG studies in the future, it is recommended that researchers report their reliability estimates regarding the measurement results of their studies.