André A. Rupp is Assistant Professor in the Department of Measurement, Statistics, and Evaluation at the University of Maryland. Dr. Rupp’s current research centers on developing methodological frameworks and modeling approaches that support rigorous interdisciplinary exchange between measurement specialists, substantive researchers, and applied practitioners. Two promising research areas in which he is intimately involved are diagnostic classification models (DCMs), which are the focus of this book, and modern measurement approaches for innovative digital learning environments. Jonathan Templin is Assistant Professor in the Department of Educational Psychology and Instructional Technology and the Georgia Center for Assessment at the University of Georgia. His research focus is on the development and application of latent-variable models for educational and psychological measurement, with much of his work being in the field of DCMs. He has sought to expand the practicality of DCMs by developing models for specific purposes and presenting his research in didactic ways to increase the potential for DCM use by scientists and practitioners in multiple research areas. Robert A. Henson is Assistant Professor in the Department of Educational Research Methodology at the University of North Carolina at Greensboro. His major research interests have focused on DCMs, with a primary focus on developing concepts and procedures for DCMs that are analogous to common concepts and procedures of more traditional measurement techniques. Dr. Henson’s hope is that, by expanding concepts that are already familiar in other settings, DCMs will be developed using a common methodology for assessments that will provide fine-grained information. Additional interests include latent-variable models in general and mixed linear models.