Abstract
This paper describes the usability testing conducted to evaluate an educational application for exploring heart anatomies which utilizes the recently introduced Leap Motion (LM) device for hand gesture-based input. The aim of the testing was to identify any usability problems with the LM and the application interface and to assess the potential of gesture-based interaction for educational tools. The test exposed the need for providing demonstrations of required gestures at the interface, basing commands on simple and intuitive single gestures, and designing better icons with clear usage descriptions. It also showed that participants found LM-based interaction highly learnable and enjoyable despite the usability problems they encountered and revealed their willingness and enthusiasm for using educational tools which support gesture-based user interaction in the future.