Page 131 - THE DUTCH TALKING TOUCH SCREEN QUESTIONNAIRE

Chapter 4 people who lack the necessary skills to use ICT \[31\]. Looking at the results of studies that evaluated the satisfaction about the ease of use of earlier developed talking touchscreens, a similar picture of highly satisfied study participants emerges \[44-50\]. The qualitative results in two of these studies also show that participants’ expectations regarding the ease of use of the tested tool were exceeded \[44,47\] and two other authors report that satisfaction among the study participants was “extremely” and “overwhelmingly” high \[45,48\]. In all of the comparable studies a large proportion of the study participants had no or limited computer experience \[44-50\]. It is reasonable to assume that limited computer experience may have led to low expectations regarding the ease of use of the talking touchscreens and therefore, played a role in the high satisfaction outcomes. Strengths and limitations It is a strength of this study that all three aspects of usability, instead of just satisfaction and efficiency, were thoroughly tested and that all of the results of the tests were differentiated for none, little and average/high experienced users (which was not the case in the reports of the comparable studies \[44-50\]). To this date this is the first study on usabilityoftalkingtouchscreensthathastakenthisapproach.Asaresult insight was gained into what kind and amount of usability problems are encountered by the most vulnerable group of potential future users. It is a strength in itself that none as well as little and average/high experienced users of mobile technology were included in the current study. Although recommended in the literature \[12,53\], to this date there has been an insufficient amount of empirical studies to prove the worth of involving future users at risk of exclusion in the development process of eHealth tools \[54\]. In a recent review Latulippe et al. found only three studies that involved future users at risk of exclusion in their design and evaluation processes \[8\]. The current paper contributes to the body of knowledge of inclusive mHealth design which involves active participation of vulnerable potential future users in usability evaluation. The qualitative TSTI method \[32\] was chosen for data collection in the current study. This method was never used in a usability study before. The results of the current study show that the TSTI method is suitable to gain insight in the usability of mHealth tools. It helped the researchers to understand not only what kind of usability problems 130