Figure 9-8. Original shopping cart design, without assurance center
Figure 9-9. Shopping cart redesign for site shown in Figure 9-8, with assurance center—but resulting in a 4% conversion rate drop

Can we say with absolute certainty that adding an assurance center for this client will always produce negative results? No. Several elements could have influenced this particular design and caused the drop in conversion rate. For instance, the assurance center design, copy, or location could have caused the drop. Analyzing how a hypothesis is validated through testing data and creating a follow-up hypothesis is at the heart of conversion optimization. In this case, we needed to test many different elements around the assurance center before we could determine its impact on conversions.

Tests that produce increases in conversion rates are excellent in terms of validating initial assumptions and hypotheses. We do not mind tests that result in reduced conversion rates because we can learn something about our hypotheses from these tests. It is tests that do not produce any increases or decreases in conversion rates that we worry about.

Two factors can impact your conversion rate. These are:

  • Internal factors that you can control, such as your design, messaging, copy, and so on.

  • External factors over which you have little control. For example, when a competitor runs a large sale, your conversion rates can suffer. If the economy gets worse, you can expect your conversion rates to suffer as well.

Successful testing requires that you pay close attention to external factors. And although you have no real way to control these factors, you should attempt to minimize the time it takes to run your experiments. The less time it takes to run tests, the fewer chances external factors have to influence your test results.

As mentioned, you can test a number of elements on your website. In the subsections that follow we discuss the 49 things you should test across your website. We have discussed some of these elements in different sections in the book, but we are including them all here for easy reference.