Dr. Hongyun Liu received her Ph.D. degree from the School of Psychology at Beijing Normal University. She is currently a professor in Faculty of Psychology at Beijing Normal University and has been working on the research of quantitative psychology for more than 15 years. Her main research areas are psychological statistics, the theory and applications of psychological and educational measurement, and quantitative research methods. Her research interests involve the Internet-based test development, the theory and application of educational and psychological assessment, data analysis methods in large-scale assessments, and longitudinal data analysis.