When I first wrote this article in 2011, I mentioned how the marketing copy for Crazy Egg’s heat-mapping feature could have been stronger by better explaining how the tool helps customers to increase conversions. While this information is clearer now thanks to the detailed visuals and simple copy layout that allows the reader to skim and scan — it could be better by explaining a bit more.
Testing can be conducted sequentially or in parallel. In sequential testing, often the easiest to implement, the various versions of the webpages are made available online for a specified time period. In parallel (split) testing, both versions are made available, and the traffic is divided between the two. The results of sequential split testing can be skewed by differing time periods and traffic patterns in which the different tests are run.