This example makes use of the real-time collaboration available in Explain Everything Collaborative Whiteboard. Two users (students), each on their own iPads, sitting near each other can plan and model an explanation of a mathematical concept, showing two versions of the same thing simultaneously. I think it would be great to have students prepare a library of reference videos that visually explain concepts that sometimes need a second (or third) listen and watch in order to make sense of the complexity. Through the production of such videos, students not only articulate their thinking for themselves, but also have to think about an audience who may not see or understand the (mathematical) world the same way as they do, creating an opportunity to build empathy.
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TEDxNYED: About Assessment