| Performance expectancy | Davis, 1989 ; Venkatesh & Davis, 2000 ; Greenhalgh, 2005; Rogers, 2003 ; Venkatesh et al., 2003 ; Kijsanayotin et al., 2009 ; Sumak et al., 2010 ; Lakhal et al., 2013 |
| Effort expectancy | Davis, 1989 ; Moore & Benbasat, 1991 ; Thompson et al., 1991; Kijsanayotin et al., 2009 ; Oye et al., 2012 |
| Social influence | Jacobsen, 1998; Sheppard et al., 1988; Ajzen, 1991 ; Venkatesh & Davis, 2000 ; Rogers, 2003 ; Venkatesh et al., 2003 ; Kijsanayotin et al., 2009 ; Sumak et al., 2010 ; Lakhal et al., 2013 |