Original TAM. Source: Xxxxx 1991 XXX received several critics as, on average, it can only explain up to 40-50% of cases. It has been continuously studied and expanded, and alternative methods have also been introduced. Among major upgrades, there is the so-called TAM 26 and the Unified Theory of Acceptance and Use of Technology (or UTAUT)7. A TAM 38 has also been proposed in the context of e-commerce with an inclusion of the effects of trust and perceived risk on system use. While Xxxxx introduced only PU and XXXX, Xxxxxxxxx in XXX 2 (FIGURE 4.3) considers also other factors that influence acceptance beyond generic external variables (not further investigated in the original TAM model). The TAM 2 model added, “theoretical constructs involving social influence processes (subjective norm, voluntariness, and image) and cognitive instrumental processes (job relevance, output quality, and result demonstrability)” 9. These social and cognitive constructs are hypothesised as the determinants of perceived usefulness. In detail social influence covers: 6 “A theoretical extension of the technology acceptance model: Four longitudinal field studies”, Xxxxxxxxx, Xxxxx, 2000 7 Venkatesh et al. 2003 8 Venkatesh & Bala 2008 9 “A theoretical extension of the technology acceptance model: Four longitudinal field studies”, Xxxxxxxxx, Xxxxx, 2000
Original TAM. Source: Xxxxx 1991 XXX received several critics as, on average, it can only explain up to 40-50% of cases. It has been continuously studied and expanded, and alternative methods have also been introduced. Among major upgrades, there is the so-called TAM 26 and the Unified Theory of Acceptance and Use of Technology (or UTAUT)7. A TAM 38 has also been proposed in the context of e-commerce with an inclusion of the effects of trust and perceived risk on system use. While Xxxxx introduced only PU and XXXX, Xxxxxxxxx in XXX 2 (Figure 4.3) considers also other factors that influence acceptance beyond generic external variables (not further investigated in the original TAM model). The TAM 2 model added, “theoretical constructs involving social influence processes (subjective norm, voluntariness, and image) and cognitive instrumental processes (job relevance, output quality, and result demonstrability)” 9. These social and cognitive constructs are hypothesised as the determinants of perceived usefulness. In detail social influence covers:
