With support from the Improving Undergraduate Education: Hispanic-Serving Institutions (HSI Program), this Implementation and Evaluation Project (IEP) Level 1 Track aims to improve the classroom experience and academic success of undergraduate students in introductory science, technology, engineering, and mathematics (STEM) courses. Too many students who enter college intending to pursue STEM careers leave STEM majors within the first few years, in part because they do not feel supported or successful in their early courses. The project will address this issue by training graduate teaching assistants, who lead many of these foundational STEM courses, in teaching strategies that recognize and build on students’ strengths and experiences. These strategies will support graduate educators in creating welcoming classrooms, connecting course material to students' experiences, and offering meaningful feedback that supports growth for all students. The project expects to reduce failure and withdrawal rates in foundational STEM courses, increase students’ confidence and sense of community, and ultimately improve persistence in STEM majors. This work will contribute to national efforts to improve undergraduate STEM education, thereby contributing to increases in the STEM workforce. Fifty graduate educators who teach foundational STEM courses will participate in a training institute over three years on using student-centered and asset-based teaching strategies, impacting 1,100 under