Allow your upper elementary, middle school, & high school students to research the different causes and effects of homelessness. Then use this project based learning unit to allow student to plan a community for the homeless with services and activities. This PBL unit focuses on a real world problem, while also incorporating 21st Century skills. You'll also be teaching tolerance and acceptance of others. Great for the 4th, 5th, 6th, 7th, 8th, or 9th grade classroom or homeschool.