Editor's note: Today is the fifth in a series of posts from PBL World, a global gathering of educators interested in project-based learning. Join the conversation on Twitter by following the hashtag #pblworld.
Teachers and other "education change agents" who are advocates of project-based learning often find that they have to make the case for PBL to their communities. "They need backup," acknowledged Cindy Johanson, executive director of the George Lucas Educational Foundation (GLEF) and Edutopia. In her keynote address to PBL World on Thursday, she shared highlights of new research that shows the effectiveness of PBL for achieving rigorous learning outcomes.