Thirty-seven preservice teachers engaged in a self-regulated learning experience proposed to increase their algebra content knowledge and to examine their use of data to make instructional decisions. Using weekly algebra curriculum-based measures, preservice special education teachers set learning goals and objectives, individually selected and adjusted weekly learning activities, and self-monitored and graphed their progress. A mixed-methods approach identified that all participants significantly increased in their algebra content knowledge, but the decision-making approaches among students varied greatly.