“…Since older adults represent a growing population in the mobile phone market (Berenguer et al, 2017) and the development cycle for mobile phones and applications is fairly short (Wangenheim et al, 2016), adopting lightweight evaluation techniques can be beneficial for understanding how older adults' needs and requirements are addressed by the developers in an iterative design and engineering process. One of the main reasons why older adults experience problems with mobile phone use is that there is a discrepancy between the design of devices and users' needs (e.g., Dolničar, Šetinc, & Petrovčič, 2016;Hwangbo et al, 2013;Renaud & van Biljon, 2010;Zhou, Rau, & Salvendy, 2014b). Indeed, older adults frequently experience issues while using mobile phones that reduce their ease-of-use as one of the main predictors of mobile phone usage (Motti et al, 2013).…”