“…When consumers buy products, they expect the products to meet their standards and they expect them to be 'usable' (Chan et al, 2011;Eraslan, 2013;Lee et al, 2015;Roudaki et al, 2015). Product usability is a measure of how effectively, satisfactorily and efficiently a product is used by specific consumers for specific aims (ISO 9241-11, 1998;Harvey et al, 2011;Sauer and Sonderegger, 2009;Sonderegger and Sauer, 2010;Sonderegger et al, 2012;Eraslan, 2013;Lee et al, 2015).…”