English Language Learners (ELLs) are among the fastest-growing demographic group in U.S. public schools. There are numerous recent reports documenting this phenomenon. Some reports estimate the numbers of ELLs enrolled in U.S. public schools, and other reports approximate the growth in ELL enrollment over the past five to ten years. Still, there…

The educational achievement and attainment of young people in the United States has been a long-standing issue of concern. While analyses of long-term trend data from the National Assessment of Educational Progress (NAEP) show that students in the United States have made gains in reading and mathematics over the past few decades, a sizeable…

This paper introduces a modification to the Rule Space diagnostic classification procedure to allow for processing of response vectors that contain missing data. Rule Space is an approach to diagnostic classification that involves characterizing examinees' performances in terms of an underlying cognitive model of generalized problem-solving…