I came across this white paper about Dell’s email campaign optimization. The company tested factors like price, discount and subject line. After only 18 emails, the TaguchiNow’s methodology was able to increase Dell’s open rate 5 times and sales by more than 7 times in just a 4 month span. How’s that for effectiveness?

They found that “contrary to common marketing  knowledge,  test  results  revealed  that Financing, Price, and Discount were not influential. The most influential variables were Subject Line, Image,  Teaser,  and  Headline,  in  that  order.”

Here’s the white paper with photos of the ad before and after testing.

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