Project-based learning is popular with many parents, students, and teachers because of its focus on problem-solving, critical thinking, creativity, and real-world application (Gallup, 2019). It encourages teachers to act as facilitators while students actively engage in teacherand student-posed learning challenges, working alone and in groups on complex tasks organized around central questions leading to a final product. Does it work? Several recent studies from the George Lucas Educational Foundation suggest that the answer is yes -- when it is implemented with intentionality and quality. High-quality professional learning is part of that equation. Two recent randomized control trials are the focus of this column. Together, the studies involved more than 6,000 students in 114 schools with more than half the students from low-income households. They found positive impacts of two different project-based learning approaches across grades, subjects, and specific groups, and professional learning played a role in both of them.