Evaluating the effectiveness of a high school math program is crucial for its long-term success. This comprehensive study assesses the first edition of the Core-Plus Mathematics Curriculum over a five-year period, focusing on stable implementations in three schools. The researchers examine student achievement and attitudes towards the curriculum, providing valuable insights into the curriculum’s strengths and weaknesses. The study is divided into three parts: an overview of the curriculum design and development, yearly patterns in student achievement, and attitudes, beliefs, and conceptions of students. With its in-depth analysis and detailed findings, this study offers a wealth of information for educators, policymakers, and researchers seeking to improve high school mathematics education.

This comprehensive 5-year study delves into the implementation and impact of the first edition of the Core-Plus Mathematics Curriculum in three schools. Focusing on student achievement and beliefs, the research involved students with up to seven years of experience in Standards-based mathematics curricula and instruction. The study’s findings reveal stable implementations and their effects on mathematics education. By examining the curriculum’s effectiveness, this study provides valuable insights for educators and researchers seeking to improve mathematics education. The results of this study are essential for understanding the long-term impact of this curriculum on student learning and mathematical understanding.