Introduction Section I. The Why Chapter 1: Why Now? Chapter 2: PBL Mathematics: Equitable, Engaging, and Effective Chapter 3: From Problem to Project Section II Chapter 4: Chapter 4. Rigorous Content Chapter 5: Productive Inquiry Chapter 6: Identity and Agency Chapter 7: Authentic Connections Chapter 8: Meaningful Assessment Chapter 9: Growth through Reflection Section III. The How Chapter 10: Classroom Culture Chapter 11: Role of the PBL Mathematics Teacher Chapter 12: Find Inspiration Chapter 13: Launch Chapter 14: Craft Milestones Chapter 15: Manage Chapter 16: Assess Chapter 17: Reflect Chapter 18: Design the Experience Conclusion