This intervention report presents findings from a systematic review of "Accelerated Math®" conducted using the WWC Procedures and Standards Handbook (version 3.0) and the Secondary Mathematics review protocol (version 3.1). No studies of "Accelerated Math®" that fall within the scope of the Secondary Mathematics review protocol meet What Works Clearinghouse (WWC) group design standards. Because no studies meet WWC design standards at this time, the WWC is unable to draw any conclusions based on research about the effectiveness or ineffectiveness of Accelerated Math® on the mathematics achievement of secondary students, who are typically in grades 9-12. Research that meets WWC design standards is necessary to determine the effectiveness or ineffectiveness of this intervention. A Glossary of Terms is provided.