I meet with the video/creative director & the client. In detail, we go over the script & the possible scenes that will be depicted in the video. This either happens in person or via Skype. In person, I work with pencil, paper, & eraser. On Skype, I share my screen and sketch digitally in real-time.
These sketches are rough and happen quickly, keeping pace with the idea storming. Often the client &/or director will revise concepts as they see them visualized.
I will also offer my creative feedback, if solicited.
I refine the rough sketches (if necessary), make any changes, add the appropriate script text, and create a multi-page PDF of the scenes in sequence. In the case of animated videos, I create the concept art or, more often, I illustrate the multi-layer art assets used by animators.