The advent of mobile technologies in learning context, has been increased the requirements for developing appropriate usability model to align with mobile learning applications. Even though mobile learning has been studied from different aspects of pedagogy environment and technology acceptance, there is little scientific and published research on usability of mobile learning applications. To fill up the gap, in this study, a usability evaluation model with the inclusion of timeliness is developed to assess the usability of mobile learning applications. Timeliness or response time as an important feature in mobile learning, which influences learning satisfaction, can be considered to evaluate the peers and instructors’ timely response. The main objective of this study is to construct and validate a usability evaluation survey for mobile learning environments. This study employed a two round Delphi method to empirically verify the usability questionnaire by obtaining a consensus from fourteen experts regarding the questionnaire items. Results indicate that over 88% of experts have consented on all usability items represented in the usability questionnaire. The usability evaluation survey for mobile learning applications can help to improve user satisfaction and reductions in training costs. The decrease in costs attracts many researchers, interface designers and project managers to employ the usability evaluation when designing the interfaces for mobile learning applications.
