In the realm of psychology and related fields, like school psychology, obtaining informed consent from clients or participants who are 18 years old or older is mandatory for researchers. However, if the individuals are below 18 years old or under a conservatorship, their assent is crucial even if their parent or legal guardian has provided formal consent. Despite the widespread recognition of the importance of assent during research, there is a lack of research and guidelines on how to obtain it effectively. To bridge this gap, we conducted a review and created a summary of research published in school psychology journals on gaining assent during research studies. The articles were categorized based on the experimental design, population, and level of assent described. Our findings offer a comprehensive overview of the current state of research on gaining assent in school psychology, which will enhance transparency in research methods.