The first by Einstein....
"If you can't explain something to a six year old, you don't fully understand it"
The second attributed to Twain, Cicero and Voltaire...
"I would have written you a shorter letter if I had more time"
To write the "short letter" in marketing to address the ADD issue discussed previously, you really have to know your products and your target audiences. When you do, you know which words to use to illicit the desired response. Words are expensive, you can only use a few (see bill board marketing discussion below). Therefore, by knowing what will excite your target audience and fully understanding the intersection of your product and them, you will be able to create the terse, salient messages required today.