^ Good question. The high schooler's are more capable of making comprehendable plot-flow and were generally enthused to work together. They did not need much help as far as writing the script or filming. The elementary school students were much harder to get working together in a way that feels like they are doing it and not you (the teacher). This was a problem with a few of the elementary school groups, but not with any of the high school groups. Elementary kids needed a lot of guidance in script writing (but not ideas - they came up with a lot of those on their own). The more you give them to do on their own, the better, I found.
It's a challenge to do in Elementary, but very rewarding!