Can I Test More than One Thing at a Time?

Testing more than one thing at a time, such as headlines and calls to action, is called a multi-variate test, and is more complicated to run. 

You’ll also need to consider how your systems can handle split tests as well as have staff on hand able to analyze multiple results and compile the data into digestible amounts. 

Multivariate testing puts a lot more on your plate at once: but it shouldn’t necessarily be avoided. If you have the right procedures in place to handle the extra workload, then go ahead – but if you want a more simplistic approach: one A/B test at a time is just fine.