The purpose of this report is to provide an update on the state of the research on testing accommodations, as well as to identify promising areas of research to further clarify and enhance understanding of current and emerging issues. The research described encompasses empirical studies of score comparability and validity studies, as well as investigations into accommodations use and perceptions of their effectiveness. Taken together, the current research explores many of the issues surrounding test accommodations practices in both breadth and depth. Insofar as reporting on the findings of current research studies is a primary goal of this analysis, a second goal is to also identify areas requiring continued investigation in the future. (Contains 37 tables and 1 figure.)