Technology Acceptance Model
Technology Acceptance Model (TAM) is an extension of the Theory of Reasoned Action (TRA) (Ajzen & Fishbein, 1980), which explains individuals' behaviour on the basis of their beliefs and intentions. TAM concentrates on the analysis of IS and reflects the acceptance of different applications. TAM introduces two key constructs: Perceived Usefulness (PU) and Perceived Ease Of Use (PEOU) (Davis, 1989; Davis, Bagozzi, & Warhaw, 1989). Perceived usefulness is the degree to which users believe the use of a specific IS will improve performance (Davis, 1989; Klopping & McKinney, 2004); ease of use is the perception that using a specific IS will not require additional effort (Davis, 1989; Robinson, Marshall, & Stamps, 2005; Fuller, Hardin, & Scott, 2007). Generally speaking, perceived ease of use has a direct effect on usefulness (Yi, Jackson, Park, & Probst, 2006; Shim & Viswanathan, 2007) and both have an effect on final decisions (Bradley & Lee, 2007; Kamhawi, 2007).
Other new variables influence the effect of usefulness and ease of use upon the variable to be explained and increase the explanatory power of the model. These variables include extrinsic influences, e.g. peer group pressure or business environment, and internal factors e.g. compatibility or technological culture (Achjari & Quaddus, 2003; Bruner & Kumar, 2005).