No one expects marketing to be perfect 100 percent of the time. That's why we test a lot in this business. But the expectation is that once we've learned from our testing, we should be applying that knowledge wherever we can to improve our marketing efforts continually.
Each of the 10 marketing blunders I've described here is a lesson someone learned, sometimes the hard way.
The good news is that their mistakes are your learning opportunities. Don't doom yourself to repeating history.
Last suggestion: print this piece out and see if your company is currently committing any of these blunders.
If so, fix them.