This step is often overlooked but can be very important, especially for videos. A storyboard for a multimedia project is like an outline for an essay. You plan out, step by step, what someone viewing your project will see, hear, and experience.
A storyboard shouldn't be set in stone but is a working document that you can adjust as you create your project. It provides guidance and a solid plan, and will take away a lot of the uncertainty in your project. It's also useful to start gathering your materials (pictures, audio, video) while creating a storyboard so you don't have to scramble to find them all later.