Usability Testing of Instant Messaging Apps Using Measured and Self-Reported Data

Instant messaging apps are among the most widely used smartphone apps, but little research has been done on their usability. We conducted an experiment in which thirty volunteers used four common instant messaging apps for 2 to 3 weeks, and we observed their interaction with these apps in controlled conditions. We observed that effectiveness ranged between 69% and 96% and varied significantly (F = 19.551, p F = 5.447, p F = 40.026, p