“…Interestingly, Dagher et al (2015) also found that self-efficacy has a significant positive influence on the three dimensions of employee engagement (vigor, dedication, and absorption) using a sample of employees in the service industry from Lebanon. On the other hand, some scholars argued that personality traits have a moderating effect on the relationship between Perceived Supervisor Support (PSS) and frontlines' service performance and that the Social Exchange Theory (SET) is the best context to explain it, since employees with different personality traits, though working under the same organizational practices, will form different perceptions (Petrou et al, 2011;Ruppel et al, 2013;Fullarton et al, 2014;He et al, 2015) and therefore develop different levels of obligation to return the organization's favors (Oentoro et al, 2016).…”