As a high school math teacher at a charter school in Boston, I struggled to teach algebra to students with varying levels of math skills. Some entered my classroom still needing to master changing fractions to decimals and percentages, while others were ready to grapple with the quadratic equation, point-slope form and writing linear equations. At this school I was one of two ninth-grade algebra teachers among a team of four math teachers in the building. Through regular dialogue with my colleague Jeff, I learned that he faced similar challenges in his algebra classroom. Together we decided at the end of the first term of the school year to engage in a discussion with the math staff around how to better meet the mathematical learning needs of all of our ninth-grade students. We believed something could be done to correct the teaching and learning challenges in our classrooms before the end of the school year. It was evident to Jeff and me that heterogeneous grouping in the algebra classroom was not working. The inability to provide curricular challenge for higher performers was affecting student engagement and motivation, and the inability to adequately support struggling students (due to lack of time and resources) was impacting students’ self-efficacy in math and overall academic self-confidence.