be a major determinant of whether or not he actually uses it. Attitude toward
using, in turn, is a function of two major beliefs: perceived usefulness and
perceived ease of use. Perceived ease of use has a causal effect on perceived
usefulness. Design features directly influence perceived usefulness and
perceived ease of use. Since design features fall into the category of external
24
Design
Features
variables within the Fishbein paradigm (as discussed previously), they are not
theorized to have any direct effect on attitude or behavior, instead affecting
these variables only indirectly through perceived usefulness and perceived ease
of use. Following the Fishbein model, the relationships of the model are
theorized to be linear. The model can be expressed using the following four
equations