Desideria, G. and Bandung, Y. 2020. User Efficiency Model in Usability Engineering for User Interface Design Refinement of Mobile Application. Journal of ICT Research and Applications. 14, 1 (Jul. 2020), 16-33. DOI:https://doi.org/10.5614/itbj.ict.res.appl.2020.14.1.2.