Michael Russell, Thomas Hoffmann, and Jennifer Higgins describe how the principles of universal design were applied to the development of an innovative computer-based test delivery system, NimbleTools, to meet the accessibility and accommodation needs of students with a wide range of disabilities and special needs. Noting the movement to computer-based testing and the concerns facing assessment of special needs students, Russell, Hoffmann, and Higgins discuss how NimbleTools, with its multiple avenues for accommodations, provides a concrete example of how to improve access and achievement for students with special needs. (Contains 13 exhibits.)