More specifically, he focuses on contemporary item response models called diagnostic classification models (DCMs). His recent research has examined the use of longitudinal item response models to assess student growth and evaluate educational interventions. In addition to methodological research, Madison collaborates with applied researchers to use DCMs and other psychometric models to answer substantive questions in educational contexts. Madison received his Ph.D. in quantitative methodology and a master’s degree in statistics from the University of Georgia. He received a master’s degree in mathematics from central Michigan university and bachelor’s degree in mathematics from the University of South Carolina.