A movie's first step into the production stage is when it gets a storyboard. A storyboard is a giant bristol board, on which you can tack story sketches, which are (surprise!) sketches which illustrate the story. What these boards do is show roughly how every scene in the movie will look. The movie scripts are either written at the same time or slightly before the storyboards. However, the two undergo constant revisions at the same time, so it is fair to say they go together. The dialogue is also recorded at this time - it too will often undergo revisions. The reason the storyboards are pinned up, in case you haven't guessed, is so that they can be easily torn down, as they often are when the story changes. Once the dialogue has been recorded, and the story sketches are finished (at least for the time being), they are combined on what is called the story reel. The story reel is a combination of the soundtrack and the story sketches. Basically, all of the sketches are filmed (or scanned into a computer) in time to the dialogue, so you end up getting a movie, that will sound almost the same as the final movie will, but instead of animation, you just have a picture that changes every few seconds. In full animation, this is just the beginning. The story reel will later become the work reel as animation is completed. Basically, as each scene is animated, the story sketches are cut out of the reel, and are replaced by the animation. Eventually, all of the story sketches disappear and are replaced by animation, which will be cleaned up and colored; then the work reel actually becomes the final movie.