One of the most often overlooked aspects of long-term copywriting success is testing. Top copywriters and marketers are always be testing their successful ad copy against variations. Will shorter or longer sentences work better in a sales letter? Should the headline be changed? The only way to know the truth is to test.
Don't allow yourself to come to any conclusions about your ad copy unless it is supported by testing evidence. If you don't have a method to test new copywriting variations and measure the results, you wont maximize your copy's potential. The sole reason for your ad copy is to make a sale. It is not designed to enhance your image or to win any creativity contests. Your ad copy only exists to make sales.
Don’t rely on gut instinct or the opinions of other to evaluate your ad copy. You buyers will ultimately tell which is your most effective ad copy. It doesn’t matter if you use multivariate testing or split testing, just test! Once your buyers have told you which copy is the best, make this your control copy. Now try to beat that control with something new. Often, your proven ad copy will prevail over the new copy.
Don't let that deter you. You have to test to uncover all of your customer’s likes and dislikes. Stop guessing in your marketing efforts and start continuously testing your ad copy. Listen to your buyers in a measured and scientific way. Only trust your buyers to tell you the truth. This is the only way your will know.

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