The animation below is the subject of the article "Covariational Reasoning Among U.S. and South Korean Secondary Mathematics Teachers" by Pat Thompson, Neil Hatfiled, Hyunkyoung Yoon, Surani Joshua, and Cameron Byerley, to appear in Journal of Mathematical Behavior.

Teachers collectively viewed a projection of this animation on a large screen. Click here to see and print teachers' response sheet.

Follow this link for examples of tasks that we considered but chose not to use.