This article describes types of progress-monitoring techniques that mathematics interventionists and special education teachers can implement in classrooms to make informed, data-driven decisions about early mathematics intervention. Although educators may be using some of these assessment types already to inform instruction, this article introduces the most current and comprehensive practices. The authors first describe four different levels of progress monitoring and then provide information regarding how to create a tracking tool in Excel that can be used to chart progress over time. (Contains 1 table, 2 figures, and 1 note.)