The development of the Texas Assessment of Knowledge and Skills test involves input from educators across the state. The development process attempts to create an assessment that reflects the skills and content understanding of students at the tested grade level. This study attempts to determine other factors that can affect student performance on this test. Specifically, it set out to determine the readability of the test. Readability of the "most easy" and "most difficult" items, as identified by Rasch difficult-item analysis, was performed. Readability of the Texas Assessment of Knowledge and Skills fifth-grade science test reveals grade levels higher than fifth grade in readability and no difference between readability of the "most difficult" and "most easy" questions. (Contains 2 tables.)