Coherence Principle
People learn better when extra words, pictures, and sounds are excluded rather than included.
A Recipe for Cognitive Balance: an Open Educational Resource for mastering Richard Mayer's 12 Principles of Multimedia Learning.
Just like a high-end restaurant kitchen, a learner's brain has a strict capacity limit; working memory. If a multimedia designer throws too much useless information, bad pacing, or cluttered graphics at the student, the kitchen crashes. Richard Mayer's cognitive theory of multimedia learning breaks the fix into twelve design principles, run across three operational phases.
Reducing extraneous processing, cut anything that doesn't teach the technique.
Managing essential processing, sequence the workflow so no one gets overwhelmed.
Fostering generative processing the deep work of making sense of the meal.
Extraneous processing happens when the brain wastes energy on distractions that don't help the learning goal. A master chef clears the counter to avoid mistakes.
People learn better when extra words, pictures, and sounds are excluded rather than included.
Add visual cues to highlight how essential material is organized.
Do not use graphics, narration, and identical on-screen text all at once — reading identical text while hearing it overloads the eyes.
Present corresponding words and pictures close to each other on the screen.
Present corresponding words and pictures at the same time, not sequentially.
Essential processing is the mental capacity needed to mentally represent core material. A master chef paces the workflow so line cooks aren't overwhelmed.
Present lessons in user-paced chunks rather than a continuous, non-stop stream.
Ensure learners know the names and characteristics of main concepts before diving into a complex explanation.
People learn better from graphics and spoken narration than from graphics and printed text.
Generative processing is the deep cognitive effort where the student actually makes sense of the material. This is where the meal comes together.
People learn better from words and pictures combined than from words alone.
Use a conversational, friendly style rather than formal, rigid academic jargon.
Narration should be spoken in a friendly human voice rather than a robotic text-to-speech engine.
Don't automatically improve learning just by plastering a video of the speaker's talking head on screen.
Every source used to build this resource, listed in APA style, so the credit trail stays as clean as a chef's mise en place.
Mayer, R. E. (2009). Multimedia Learning (2nd ed.). Cambridge University Press.