The comp thus serves as a draft of the final layout, and (if approved) is used as guide for further design changes and, ultimately, production.
Since computer-generated art can evolve as one file over time, finely segmented milestones in the development process have less meaning.
Even in the age of rapid desktop publishing software, comps may be developed using hand-rendering techniques and materials to avoid investing too much time on the computer before client approval of the idea, depending on the complexity of the production task.
A hand-rendered comp may be useful in helping the client refrain from "nitpicking" the production quality and focus on the design idea.
The illustration element may incorporate stock photography, clip art, or other found material that gives an idea of what should be visually communicated, before entering any negotiations concerning the rights to use a specific image for the purpose.