While there are many opinions about what constitutes good headlines, copy and design, most professionals agree that these individual elements of the ad must work together. In combination, they must grab attention, convey a persuasive message and portray a consistent identity.

An ad that's too cluttered can't convey a message quickly enough to engage the reader or viewer. One that's out of character with the product or service will be confusing rather than convincing.

An effective headline (or a broadcast ad's opening moments) must immediately capture the audience's interest and pull them into the ad. A good rule of thumb is to look for the inherent "drama" in what you are offering, and capitalize on that to create an alluring ad.

Examples: "We're Losing Our Minds" -- a university ad appealing for funds. And "You Don't Have to be Jewish to Love Levy's" -- a bread company ad featuring a Chinese man biting into a whopping pastrami sandwich.

Next, the photo or illustration amplifies the message. An ad for Bull Worldwide Information Systems, for example, showed a satellite photo of the earth with the headline "GloBull."

Once the headline and illustration have drawn the customer into your ad, the copy convinces them to buy. So make it believable, full of information, and bolstered with words and style that complement your identity. Almost any Volkswagen or Mercedes Benz print ad exemplifies convincing copy in a style that suits the product perfectly.

Broadcast advertising will also involve selecting music, sound effects, actors or announcers, and perhaps a theme song. All these elements enhance your message and reinforce your identity but, for the most part, the copy and what it conveys actually do the selling.