Information Technology Reference
In-Depth Information
The model suggests that users' decisions to ac-
cept new IS are influenced by two core constructs.
These two constructs are Perceived Usefulness
and Ease of Use.
Perceived usefulness (PU)
is
defined as “the degree to which a person believes
that using a particular system would enhance his/
her performance” (Davis et al., 1989, p. 985).
Ease of use
is “the degree to which user expects
the target system to be free of effort” (Davis et
al., 1989, p.985). Related studies have reported
in the post-acceptance stage, perceived useful-
ness directly influence users' intention to reuse
(continue using) system provided. On the other
hand perceived ease of use has significant influ-
ence on intention in pre-acceptance stage but once
user begin actually use the system, it rationally
becomes less important in formation his intention
(Szajna, 1996).
TAM has been identified as a very commonly
employed theoretical framework for studying IS
acceptance (Lee et al., 2003). There are great
amount of research related to TAM has reportedly
made it one of the most influencer IS theories
overall. In short, if the central goal to predict IS
usage, it can be argued that TAM is preferable
(Taylor & Todd, 1995).
Some current research on ERP implementation
has used TAM or various factors from it in try-
ing to understand user acceptance and continues
use to ERP system. It is also used in some many
researches to examine the successful story of ERP
implementation in the organization (Gyampah &
Salam, 2004).
to purchase. Second, users accept and use that
product or service. Following a period of initial
consumption, they form perceptions about its
performance. Third, they assess the difference
between its perceived performance and their
original expectations, and determine the extent
of the confirmation. Fourth, users then form a
satisfaction based on their confirmation level and
expectation on which confirmation was based.
Finally, satisfaction leads to a repurchase inten-
tion, on the other hand, dissatisfaction tends to
discontinue users' subsequent use.
In Sum, ECT posits that initial pre-usage
ex-
pectations
coupled with
perceived performance
;
lead to post-adoption satisfaction which in turn
forms the user intention to continue using IS
system. Satisfaction is mediated through posi-
tive or negative confirmation which formed by
comparing expectation and perceived performance
(Oliver, 1980). Perceived performance is often
conceptualized as perceived usefulness of using
IS (Bhattacherjee, 2001). In our research model,
we are going to assess the impact of confirmation
on perceived usefulness and satisfaction.
theory of planned behavior
Theory of Planned Behavior (TPB) was introduced
by Ajzen (1991). It extends the Theory of Reasoned
Action. A key purpose of TPB is to provide a basis
of tracing the impact of two primary factors on
user intention. These factors are Subjective Norm
and Perceived Behavior Control. TPB posits that
user's intention is formed due to attitude toward
the system, subjective norm and perceived be-
havior control.
Attitude (A)
defined as the user's
evaluation of the desirability of his or her using
the system (Mathieson, 1991, p.175).
Subjective
Norm (SN)
reflects perceptions that significant
desire the individual to perform or not perform a
behavior (Taylor & Todd, 1995; Matheison, 1991).
Lastly
Perceived behavior Control (PBC)
refers
to the individuals' perceptions of the presence or
absence of requisite resources and opportunities
expectation confirmation theory
Expectation Confirmation Theory (ECT) is widely
used in consumer behavior literature to study
consumer satisfaction, post-purchase behavior
(e.g. complaining, repurchase) and service mar-
keting in general (Andserson & Sullivan, 1993;
Dabholkar et al., 2000). The ECT framework
works as follows. First, consumers form an initial
expectation of a specific product or service prior
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