5. Results
The measured variables with the reliability of each scale. All measurement scales showed acceptable or high reliability with
Cronbach’saexceeding 0.78 (Nunnally, 1978).
5.2 Convergent validity of the SysTrust principles
To examine the extent to which the three SysTrust principles converged on a single
construct, the three items for the trust in system reliability scale were subjected to a factor analysis using principal component analysis. All three items loaded on a single
factor accounting for 71 percent of the variability in the trust in system reliability score.
Factor loadings for the three items ranged from 0.70 to 0.92, indicating convergence and
a strong relationship between the items and the underlying factor. Overall, the results
suggest that potential users perceive the three principles to measure one single
underlying construct as the AICPA/CICA intended.
Validity of other measures in the extended TAM
Additional analyses were performed to assess the validity of other ETAM measures. Using
principal component analysis, the four items that measured perceived usefulness of the
systemloaded on a single factor accounting for 83 percent of the variability. Factor loadings
for the four items range from 0.90 to 0.92, indicating convergence and a strong relationship
between the items and the underlying construct as well. Thus, we averaged participants’
responses to the four items to form the measure of perceived usefulness (PU).