L: Animation Principles

The principles are:

1. Timing

2. Ease In and Out (or Slow In and Out)

3. Arcs

4. Anticipation

5. Exaggeration

6. Squash and Stretch

7. Secondary Action

8. Follow Through and Overlapping Action

9. Straight Ahead Action and Pose-To-Pose Action

10. Staging

11. Appeal

12. Personality

The principles can be viewed in Google Docs (click here).


Sources:
http://en.wikipedia.org/wiki/12_basic_principles_of_animation
http://www.cgsociety.org/index.php/CGSFeatures/CGSFeatureSpecial/applying_the_12_principles_to_3d_computer_animation_by_disneys_isaac_kerlow
http://www.animationarena.com/principles-of-animation.html
http://www.siggraph.org/education/materials/HyperGraph/animation/character_animation/principles/prin_trad_anim.htm