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The Technology Acceptance Model (TAM) is an information systems theory that models how users come to accept and use a technology. The model suggests that when users are presented with a new technology, a number of factors influence their decision about how and when they will use it, notably: * Perceived usefulness (PU) - This was defined by Fred Davis as "the degree to which a person believes that using a particular system would enhance his or her job performance". * Perceived ease-of-use (PEOU) - Davis defined this as "the degree to which a person believes that using a particular system would be free from effort" (). The TAM has been continuously studied and expanded-the two major upgrades being the TAM 2 ( & ) and the Unified Theory of Acceptance and Use of Technology (or UTAUT, ). A TAM 3 has also been proposed in the context of e-commerce with an inclusion of the effects of trust and perceived risk on system use.) ==History== TAM is one of the most influential extensions of Ajzen and Fishbein’s theory of reasoned action (TRA) in the literature. Davis’s technology acceptance model (Davis, 1989; Davis, Bagozzi, & Warshaw, 1989) is the most widely applied model of users’ acceptance and usage of technology (Venkatesh, 2000). It was developed by Fred Davis and Richard Bagozzi (, ). TAM replaces many of TRA’s attitude measures with the two technology acceptance measures— ''ease of use'', and ''usefulness''. TRA and TAM, both of which have strong behavioural elements, assume that when someone forms an intention to act, that they will be free to act without limitation. In the real world there will be many constraints, such as limited freedom to act (). Bagozzi, Davis and Warshaw say: :''Because new technologies such as personal computers are complex and an element of uncertainty exists in the minds of decision makers with respect to the successful adoption of them, people form attitudes and intentions toward trying to learn to use the new technology prior to initiating efforts directed at using. Attitudes towards usage and intentions to use may be ill-formed or lacking in conviction or else may occur only after preliminary strivings to learn to use the technology evolve. Thus, actual usage may not be a direct or immediate consequence of such attitudes and intentions.'' () Earlier research on the diffusion of innovations also suggested a prominent role for perceived ease of use. Tornatzky and Klein () analysed the adoption, finding that compatibility, relative advantage, and complexity had the most significant relationships with adoption across a broad range of innovation types. Eason studied perceived usefulness in terms of a fit between systems, tasks and job profiles, using the terms "task fit" to describe the metric (quoted in ) suggest that TAM must be extended to include variables that account for change processes and that this could be achieved through adoption of the innovation model into TAM. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Technology acceptance model」の詳細全文を読む スポンサード リンク
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