The goal of this study was to learn whether and how teachers in grades 2 and 4 were using the new ULA and Mathematics TG and STBs and applying the SCSs therein. The study consisted of two phases. The Program used Phase 1 results and ensuing recommendations to inform the development and finalization of materials and ongoing TPD efforts. Phase 2 results served to determine whether teachers became more proficient over time in their application of the SCSs embedded in the TGs.