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theoretiCal baCkground and
researCh model
they termed a decomposed theory of planned be-
havior (see Figure 1). Their intent was not to try to
improve on TAM or TPB in terms of explaining
variance in intentions or use of a technology, but
rather to identify additional components of belief
structures that would provide more explanation
of the antecedents to attitude, subjective norm,
and perceived behavioral control.
In an empirical test of their model, Taylor and
Todd (1995a) found support for most of the hy-
pothesized relations. Others have since built on the
model, focusing on the constructs of technology
and resource facilitating conditions (Mathieson,
Peacock, & Chin, 2001), the interaction of age
and gender to influence user perceptions and use
(Morris, Venkatesh, & Ackerman, 2005) and ap-
plying the model to the adoption of IT by health
decomposed theory of planned
behavior
The Theory of Planned Behavior (TPB) (Ajzen,
1991) was constructed as an extension to the
Theory of Reasoned Action, or TRA (Fishbein
& Ajzen, 1975) including, in addition to attitude
and subjective norm, the construct of perceived
behavioral control. Taylor and Todd (1995a) com-
pared TAM with an adaptation of TPB, finding
that perceived behavioral control and subjective
norm added little in terms of explained variance
in intentions to use technology. Taylor and Todd
(1995a) went further, however, by proposing what
Figure 1. Decomposed theory of planned behavior (Taylor & Todd, 1995a)
Technology
Facilitating
Conditions
Resource
Facilitating
Conditions
Ease of
Use
Self
efficacy
Compatibility
Perceived
Usefulness
Peer
Influence
Perceived
Behavioral
Control
Superior's
Influence
Attitude
Subjective
Norm
Future
Intention
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