DATA IS AN invaluable tool for web designers making decisions about the user experience. A/B tests, or split tests, are one of the easiest ways to measure the effect of different design, content, or functionality, helping you create high-performing user experience elements to implement across your site. Lara Swanson shows how to make sure you avoid red herrings and reach statistically significant results in Issue No. 333 of A List Apart for people who make websites.
Illustration by Kevin Cornell for A List Apart Magazine.