The Ten Principles of multimedia learning

1. Multimedia Principle:
     People learn better from word and pictures than from words alone.
2. Contiguity Principle:
     People learn better when corresponding words and pictures are presented nearrather than far from each other in time or on the screen.
3. Coherence Principle:
     People learn better when extraneous words, pictures, and sounds are excludedrather than included.
4. Modality Principle:
     People learn better from words and pictures when words are spoken rather than printed.
5. Redundancy Principle:
     People learn better from animation andnarration than from animation, narration
     and on screen text.
6. Personalization Principle: 
     People learn better when words arepresented in a conversational style, ratherthan formal style.
7. Voice Principle: 
     People learn better when words are spokenin a non-accented human voice than in amachine voice or accented voice.
8. Signaling Principle:
     People learn better when the voice signalsimportant words rather than when there areno signals.
9. Interactivity Principle:
     People learn better when they can control thepace of presentation than when they receivecontinuous presentation.
10. Pretraining principle:
      People learn better when they receivepretraining on each component rather thanno pretraining.

Reference :
http://www.psych.ucsb.edu/people/faculty/mayer/index.php