The instructional materials for the Interactive Mathematics Program series partially meet expectations for alignment to the CCSSM for high school. For focus and coherence, the series showed strength in making meaningful connections in a single course and throughout the series. For rigor and the mathematical practices, the series showed strengths in the following areas: supporting the intentional development of students' conceptual understanding, utilizing mathematical concepts and skills in engaging applications, displaying a balance among the three aspects of rigor, supporting the intentional development of reasoning and explaining, and supporting the intentional development of seeing structure and generalizing. Since the materials partially meet the expectations for Gateways 1 and 2, evidence for usability in Gateway 3 was not collected.