He received is with a Ph.D. in quantitative psychology and an M.S. in statistics. Since 2005 Dr. Henson has taught a Hierarchical Linear Modeling course multiple times and published various papers focusing on the analysis of change across time using HLM. In addition, Dr. Henson’s current research focus is on Diagnostic Classification Models (DCMs; also known as cognitive diagnosis). DCMs are a modeling approach to scoring exams that provide a mastery profile that identifies those skills or attributes that an examinee has mastered or has not mastered.