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In observance of the 2024 holiday season, Sage offices will be closed Monday December 23rd through Wednesday January 1st. Normal operations, including shipping for orders placed during the closure, will resume on Thursday January 2nd. For technical support during this time, please visit our technical support page for assistance options. 

We wish you a wonderful holiday season. Thank you. 

Gary Skaggs Virginia Tech, USA

Dr. Gary Skaggs is a Professor in the Educational Research and Evaluation Program at Virginia Tech. He teaches courses in test development and test theory as well as introductory and intermediate statistics. He is the author or co-author of 81 publications, including articles in peer-reviewed journals, papers in conference proceedings, book chapters, invited lectures, and professional conference papers/presentations. His research interests include test equating, differential item functioning, standard setting, and cognitive diagnostic models. Dr. Skaggs has served as a test and psychometric consultant to numerous professional organizations including the GED Testing Service, Maryland State Board of Education, National Board of Professional Teaching Standards, Carilion Clinic Department of Psychiatry, and the National Association of Secondary School Principals.