TRA asserts that the most important determinant of
behavior
is
behavioral inten-
tion
(see unshaded boxes in Figure 4.1). Direct determinants of individuals’ behav-
ioral intention are their
attitude
toward performing the behavior and their
subjective
norm
associated with the behavior. TPB adds
perceived control
over the behavior,
taking into account situations where one may not have complete volitional control
over a behavior (see shaded boxes in Figure 4.1)