The variables of interest to our current research from Seddon’s model are IS Use,
Perceived Usefulness, User Satisfaction, Information Quality, and System Quality.
According to Seddon, Perceived Usefulness (which replaces the D&M IS Use variable)
is “the degree to which a person believes that a particular system has enhanced
his or her job (or his or her organization’s) performance” [76, p. 246]. The other
variables are consistent with D&M’s model; Information Quality measures semantic
success, System Quality measures technical success, and User Satisfaction measures
effectiveness success [24]. Information Quality and System Quality are independent
variables. The argument for including both of these as determinants of IS success is
that even a high-quality system can produce useless results if the needed information
is wrong or inadequate. Additional evidence to support using these two as independent
variables is available [27, 46]. Finally, IS Use is defined by Seddon [76] as
resulting from expectation of net benefits from using an IS—implying that IS Use is
a consequence of IS success and not an intrinsic characteristic of IS success; therefore,
it is separated from the rest of the model.