An interactive mobile technology to improve the usability of exam application for disabled student

Mobile devices have become a commonly used device as information technology develops. Mobile devices are also equipped with sensors that can improve device functionality. In the field of education, it can be used as an alternative control method and provides accessibility for users when used in human computer interface solutions. With mobile devices which has internal inertial sensors like accelerometer, gyroscope, and magnetometer, a head movement control method has been developed to determine the movements that can be used to navigate the application. This method changes the function of hand-based input into head-based. The combination of Head-Mounted Displays (HMDs) with mobile devices, provide an innovation of new low cost of human-computer interaction. It can be used with six type of head poses movement; move to the left, move to the right, head looking down, head looking up, tilt head toward left shoulder, and tilt head toward right shoulder. In this study, we concern to design head poses movements that are appropriate to the process of answering the exams and testing the level of user usability. Usability testing is used by disabled people to answer the test, with the usability score is 81,75 from 100 and classified as "excellent" category.