Fig. 1
From: What we learned from creating one of the world’s most popular MOOCs
a The instructor in the original studio shot and b in the final version shown on the video. With green screen, there is less concern about splitting attention between a box containing “talking head” and the illustrations or animations on screen. Not shown here is how the PowerPoint imagery was gradually introduced on the screen in accordance with Mayer’s segmenting and pre-training principles
