The document describes different socio-economic groups that can be used to identify target audiences. It outlines several social classes - upper middle class, middle class, lower middle class, skilled working class, working class, and lowest level of substance - along with example occupations for each class. It then introduces an alternative approach focusing on personality types, describing "mainstreamers" who seek security and conformity, those motivated by status, career-driven individuals who want control, idealists who want to improve the world, and non-conformists who like to be different. The mainstream audience is identified as the target for the product.