I teach at an International Baccalaureate school which follows a PYP program. We do a lot of inquiry and trans-disciplinary teaching. Here are some of the things I do in my room!
I use one of the "lines of inquiry" as a planner reflection. I write it on an index card and the students reflect on the planner to be hung on our "IB Reflection Wall."
I guess even Second Graders notice the trend. Here is an inquiry after I introduced our Economics Planner last week.