Research has consistently demonstrated that matching the difficulty of instructional material and studentskill level increases outcomes such as task completion, task comprehension, and student time on task(Daly, Martens, Kilmer, & Massie, 1996; Gickling& Armstrong, 1978; Gickling & Rosenfield, 1995;Gickling, Shane, & Croskery, 1989). This matchbetween material and skill can be assessed with curriculum-based assessment (CBA; Gickling & Havertape,1981) by computing the percentage of known itemswithin the academic task and comparing it to an optimal level, called the instructional level