We have a couple of mantras in our (the kids' and mine) classroom. One is "we are all teachers and we are all learners". It is awesome seeing the 5 year olds inform the class that they can be a teacher for a skill or activity if anyone needs one. Our other mantra is "we are all allowed to make mistakes". I call on that one a LOT!! Project based learning puts learning and teaching in the hands of the students. And the ownership is huge.