Websites have tons of elements you can test. Some elements will have very little impact on your ability to persuade and convert your site visitors. Others will have a dramatic impact. Of course you'd like to know which elements rank among the most influential when it comes to your bottom line.

We've spent the month of January working on Quick Start Guides that can help you understand which elements have the biggest effect on your conversion rates and how to test them using a simple A/B (or split) test: we now have a guide for retailers and one for lead generation. And we've also been working closely with Google to create a 10 Minute guide for their Website Optimizer.

When we created our example test for Google's nifty (and free) online testing tool, we chose a headline. When it comes to the persuasive copy you create for your website, headlines should rank as one of your highest priorities.

Why are headlines so important? They are among the very first elements of your persuasive process with which visitors actively engage. Readers of your pages use headlines and sub headlines (headers and subheaders) to understand the content on a page and decide if they want to read more of your copy. Headlines aid in the visual task of scanning and skimming, which helps your visitors organize the information you present. Worded appropriately, they encourage your visitors to go deeper into your persuasive copy.

How do you go about creating highly persuasive headlines? What sorts of things about headlines can you test? These are the same questions the Google folks asked us. So, for our documentation, I created a list of ways you can test your headlines. Below is an excerpt of the top ten, with examples.

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