Pose to Pose:
"Straight ahead animation starts at the first drawing and works drawing to drawing to the end of a scene. You can lose size, volume, and proportions with this method, but it does have spontaneity and freshness. Fast, wild action scenes are done this way. Pose to Pose is more planned out and charted with key drawings done at intervals throughout the scene. Size, volumes, and proportions are controlled better this way, as is the action. The lead animator will turn charting and keys over to his assistant. An assistant can be better used with this method so that the animator doesn't have to draw every drawing in a scene. An animator can do more scenes this way and concentrate on the planning of the animation. Many scenes use a bit of both methods of animation." -Frank Thomas and Ollie Johnston. Keyframes, breakdowns, and eases. See Keith Lango's "Pose to Pose"and "Breakdowns can be Such a Drag" Tutorials for more.
Jeff Gabor Comparison Videos:
Tell a story though a minimum of 12 poses. Deliver as a 1 frame/pose quicktime movie
Read to page 167 in ASK