At the start of a new unit I have students fill in these charts. I pick 3-5 hot topics from the unit and have them write what they know about each idea. I collect these and use their words to help start conversations throughout the unit. Then at the end of the unit, I have them go back and fill in what they know now. This gives them a chance to explain what they have a learned and see how far they have come with each topic. It also helps me show growth!