According to Venkatesh and Bala (2008), the prognostic power of the TAM model makes iteasy to relate variables predicting ICT acceptance. It was originally developed by Davis in 1989,which itself was derived from the Theory of Reasoned Action model by Ajzen and Fishbein(1980). Figure 1 shows the primary TAM, which determines the influence of five internal vari-ables upon the real use of a specific technology or system. The internal variables in the primaryTAM are: two cognitive beliefs constructs, PEoU and PU, an affective construct, AT, an inten-tion construct, BI, and a behavioral response construct, AU (Davis, Bagozzi, & Warshaw, 1989).