Yumei Li is currently a Ph.D. candidate at the Department of Social and Behavioural Sciences, City University of Hong Kong. Yumei has engaged in assessment-based behavioral and psychological research, such as psychological measurement and assessment, prevention of problematic technology use, and well-being promotion. She explores the underlying mechanisms in different contexts using different quantitative analysis methods. She aims to design and implement evidence-based intervention programs at the individual or systemic level to help people, especially children, and adolescents, reduce psychological distress and behavioral problems, and enhance the quality of life, mental health, well-being, and positive development.