This document discusses project-based learning (PBL) in math education for the 21st century. It explains that PBL leads students to gain essential knowledge and concepts by confronting realistic dilemmas that allow for more than one solution. Students become intrigued by and motivated to solve problems by working with peers and teachers. They demonstrate new standards-based knowledge in authentic formats. The document outlines the PBL process, including crafting driving questions, planning assessments, mapping the project, managing the process, and introducing PBL while focusing on standards and developing 21st century skills.