The purpose of this study is to examine the characteristics of reading test items that may differentially impede the performance of students with disabilities. By examining the relationship between select item features and performance, the study seeks to inform strategies for increasing the accessibility of reading assessments for individuals from this group. Including students with disabilities in large-scale, statewide assessment and accountability systems, as mandated by the Individuals with Disabilities Education Act (IDEA, 2004) and the "No Child Left Behind" (NCLB) Act of 2001 (NCLB, 2002), can help identify issues and guide instruction to improve education for these students. Research on reading complexities for students has primarily focused on the role of vocabulary and sentence length, and has also touched upon issues of legibility such as format, typeface, and visuals. Although research reveals that readability measures are widely used and beneficial for matching students' reading levels with appropriate text, they do not identify the precise grammatical and cognitive components within sentences, paragraphs, or passages that may contribute to complexity for students with disabilities. While current research does address the critical need to accurately assess the reading performance of students with disabilities, a void in operationalizing reading complexity exists.