The 12 Principles of Animation are a set of guidelines introduced by Disney animators Ollie Johnston and Frank Thomas to create more realistic and compelling animations. The principles are: Squash and Stretch, Anticipation, Staging, Straight Ahead Action and Pose to Pose, Follow Through and Overlapping Action, Slow In and Slow Out, Arc, Secondary Action, Timing, Exaggeration, Solid Drawing, and Appeal.