Previous researchers have been consistent in arguing that PU has a positive direct effect on acceptance of a system (Gefen & Straub 2000; Pavlou 2003). There are different aspects that define PU in an e-commerce environment. For instance, the quality of a website in terms of system, service and information quality has a significant impact on perceived usefulness, which in turn encourages consumers to buy (Ahn et al. 2007).