Coherence

People learn better when extraneous material is excluded rather than included.

Avoid irrelevant graphics, stories, and excessively lengthy text

This Mystery Science graphic demonstrating the depth of the Mariana Trench with minimal annoation.

Remove unneeded words and symbols

This iCivics Game on US history simplifies the map for young learners.

Avoid irrelevant videos, animations, music, sounds, stories, and lengthy narrations

This tutorial video from Miro Academy mutes background music when the instructor is presenting the Miro interface.