Making Web Advertisements Work

There are many reasons why advertisements don't work well on the Web, but it is most unsettling when an ad actually portrays something relevant to users and still fails. Why would this occur? Well, to start, we must consider why text ads work so well on search engines. Each user has a goal -- perhaps it is to learn about digital cameras, perhaps to purchase a book. In either case, users' attention is focused on whatever gets them to their goal; they ignore everything else. When users enter search queries, the targeted ads that the engine returns relate directly to what users are after. Hence, they look at and follow the ads. Indeed, such advertisements probably have an advantage over the plain search results because they show both that the advertiser is competent and has a direct interest in serving consumers.

Nielsen, Jakob and Donald A. Norman. Alertbox (2003). Design>Web Design>Marketing>Usability

Usability On The Web Isn't A Luxury

On the Internet, it's survival of the easiest: If customers can't find a product, they can't buy it. It's cheaper to increase the design budget than the ad budget, and attention to usability can increase the percentage of Web-site visitors who complete a purchase.

Nielsen, Jakob and Donald A. Norman. Information Week (2000). Articles>Web Design>Usability