Comparison of Moderated and Unmoderated Remote Usability Sessions for Web-Based Simulation Software: A Randomized Controlled Trial.

Usability studies are a crucial part of developing user-centered designs and they can be conducted using a variety of different methods. Unmoderated usability surveys are more efficient and cost-effective and lend themselves better to larger participant pools in comparison to moderated usability surveys. However, unmoderated usability surveys could increase the collection of unreliable data due to the survey participants' careless responding (CR). In this study, we compared the remote moderated and remote unmoderated usability testing sessions for a web-based simulation and modeling software. The usability study was conducted with 72 participants who were randomly assigned into a moderated and unmoderated groups. Our results show that moderated sessions produced more reliable data in most of the tested outcomes and that the data from unmoderated sessions needed some optimization in order to filter out unreliable data. We discuss methods to isolate unreliable data and recommend ways of managing it.