The one constant with every PBL unit you do with your kids is the final product presentation. Considering that many of us did not grow up in a time where presenting was a norm for us, it might be difficult to teach the finer details of what makes the connection between presenter and audience. I ran across this video that I thought might help: 5 Things Every Presenter Needs To Know About People
5 Things Every Presenter Needs To Know About People from Weinschenk on Vimeo.