Measured Progress and the Psychometric Tools team are pleased and excited about our partnership with Professor William Stout. Both DIF-Pack and DIM-Pack have become well known tools throughout the psychometric community. By moving these tools into an open-source platform we hope to expand their use and create an inclusive community where researchers and practitioners are encouraged to enhance and expand the tools.

Enhancements can include bringing the code into a .NET framework, providing better front end functionality, extending the code to new applications, or conducting research that leads to the development of new software. Professor Stout and Measured Progress psychometricians are committed to a long-term interactive relationship and we invite you to join us as an active participant in this endeavor.

William Stout

William F. Stout is Professor Emeritus in the Department of Statistics at the University of Illinois at Urbana-Champaign. His psychometric research interests include dimensionality, DIF, and skills diagnosis. He has served as a project leader of a cognitive diagnostic research group for ETS, as a Fellow for the Institute of Mathematical Statistics, and as President of the Psychometric Society. He is currently a research professor in the Learning Science Research Institute (LSRI) at the University of Illinois at Chicago, co-directed by Professors Jim Pellegrino and Susan Pellegrino. His current research focus is on the psychometric aspects of developing formative assessment instruments that display validity, broadly and appropriately interpreted.