When is an illustration worth ten thousand words?

• DOI: 10.1037/0022-0663.82.4.715
• Publication Date: 2005-09-15T14:29:01Z
• Authors: Richard E. Mayer; Joan K. Gallini
• Keywords: 4. Education; 05 social sciences; 0501 psychology and cognitive sciences

In three experiments, students read expository passages concerning how scientific devices work, which contained either no illustrations (control); static of the device with labels for each part (parts), major action (steps), or dynamic showing «off» and «on» states along (parts-and-steps)