The document discusses project based learning (PBL). It defines PBL as a teaching method where students gain knowledge and skills by investigating and responding to engaging questions or challenges over an extended period of time. PBL is grounded in elements like role playing, real-world scenarios, and authentic assessments. It helps develop skills like research, collaboration, and communication. The document also outlines types of projects, components of PBL, benefits and drawbacks, and includes an example lesson plan on teaching layers of the Earth through a project.