Advertisements reference their own products and make claims about them. Other claims are implicit. Ads create these claims by situating products in an implied world such that possession of the product seems in some way linked to the accessibility of this imagined world. This connection is often crucial to the power of the ad. When I am buying the product, I am seeking not merely the product itself but to become part of the world imaged by the advertisement.
Semiotic analysis is never complete.
Interviews are required here because everyone reads ads differently. The most powerful analyses of advertisements shuttle back and forth between the text and the readings people give us about those texts.