Mockups can be developed and expanded throughout the development of a multimedia design.

Each screen is designed with blanks to hold its contents.

For example, a block representing text to appear in the left=hand side of the screen, might be drawn on the left. The right might be broken into two parts, with the top right for a graphics and the bottom right for a person speaking.

As the design progresses, the file names of these assets may be written in these areas.

Ultimately, the assets, themselves, will appear in these areas.