So you have a killer direct mail control package. Well done. It's getting some results... it's been working for years... it's a control, after all.
But here's the thing. You can always improve your control.
Whether little by little through split testing or head-to-head with a brand new creative execution, you should always put your control to the test. And if a new control unseats your original... it's time to do it again.
Read on to learn how to build a package that can bust your control.