The animation historians at Disney say that “at most animation studios, the best animators only sketched a few animation drawings, leaving gaps in between. Later on, a person called an "inbetweener" would finish the scenes by drawing in between the areas that the animator had left.” Well, not much has changed about this key position.
Today most job descriptions affirm that inbetweeners are responsible for the continuity of movement between scenes in an animated production. Inbetweeners decide how animated characters will move
