Since the launch of labels in the AdWords interface it can make running and reviewing simple ad copy tests much, much easier. This is especially true if you're running an ad copy test across multiple ad groups at once, and, though this can make it a bit more difficult to evaluate, for a lot of small accounts it's the only way to quickly progress.
Latest thoughts for: labels
Thoughts by subject
Like the Brain? Sign up for the packed-full-of-tips monthly newsletter