“…The ISO also defines that at least one indicator in each of these aspects should be measured to determine the level of usability achieved [136]. In order to evaluate satisfaction, we consider the Method Evaluation Model (MEM) [137] [133] which contemplates three primary constructs: perceived ease of use -PEOU ("the degree to which a person believes that using a particular system would be free of effort"), perceived usefulness -PU ("the degree to which a person believes that using a particular system would enhance his or her job performance") and intention of use -ITU ("the extent to which a person intends to use a particular system").…”