User testing is a great way to validate assumptions and gain new insights about how people interact with our websites and apps. When it comes to eCommerce (and in particular mobile commerce or “mCommerce”) it’s critical to understand how people find and purchase products online. This was evident on one project where we were tasked with testing the mobile website design for retail membership giant, Sam’s. As it turns out, there are many common navigation patterns that aren’t nearly as effective as people might think.