Mark Fenske teaches advertising in the graduate program at VCU in Richmond. He used to keep a sketch book, or what he calls a workbook. Here’s a page from his workbook:
Here’s some text from Fenske’s blog entry about workbooks:
The job of a copywriter or art director isn’t fun and it isn’t easy. Jackasses often get the final say about whether our work runs or is even presented to a small group of people. Genuine hacks often are given free rein to edit our work. There is no honor in the advertising business. Although you cannot create high level work without approaching it as an artist, you will not find yourself treated as an artist. In short, you will not be able to love the job of advertising copywriter or art director as you would like to. Do not fear. Your desire is not muted. Only misdirected.