After 30 years of practicing, researching, and teaching project-based learning (PBL), Steven Wolk offers insight into what he has learned. He discusses what PBL is and responds to common misunderstandings about how it works. He describes how PBL units are structured, the role of direct instruction in PBL, how students learn content and skills through PBL, and the importance of a culture of inquiry to a PBL classroom. And he shares inspirational ideas for how teachers and schools can take PBL even further, such as by designing problem-based PBL units.