Three items were used to tap the Perceived Usefulness construct, adapted from previous Technology Acceptance Model research (Deane et al., in press). Respondents were asked to indicate the extent oftheir agreement with each item on a five point numerical scale, ranging from 1-strongly disagree to 5-strongly agree. An example ofa perceived usefulness item is ‘‘The system helps to get my grocery shopping done efficiently’’. A Cronbach alpha internal consistency coefficient of 0.82
was obtained, within the current study.