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October 2012 Volume 15 Number 4 - Educational Technology ...

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service quality of IS functions. We thus adopted their scales and chose some items associated with service quality as<br />

the means of measurement.<br />

User satisfaction and intention to use were respectively measured by 4 and 9 items, mainly from DeLone &<br />

McLean's (2003) scales. We adapted items from their scale because, according to ISSM theory, user satisfaction is<br />

the critical factor affecting user adoption of information systems. Davis et al. (1989), DeLone & McLean (2003), and<br />

Teo et al. (2008) also claimed that evaluating intent to use was the final goal for practitioners in terms of<br />

understanding the strategies that underlie user adoption of any information system. Therefore, we adopted their<br />

scales and chose some items associated with intention to use as the means of measurement.<br />

Assessing reliability and validity<br />

Instrument reliability<br />

According to Wortzel (1979), a Cronbach's α coefficient between 0.7 and 0.98 indicates enhanced reliability.<br />

Following reliability analysis, Cronbach's α coefficient of intention to use (IU) reaches a high of 0.952. All<br />

dimensions are over 0.800 and, overall, Cronbach's α is 0.979, meaning that the questionnaire dimensions have a<br />

high degree of homogenous consistence and reliability to distinctively reflect the study’s structural dimensions. Table<br />

1 shows the detailed reliability coefficients.<br />

Table 1. Reliability analysis results of post-test questionnaire<br />

Variable Cronbach's α value Cronbach's α based on standardized items<br />

User motivation (UM) .871 .870<br />

Computer self-efficacy (CSE) .871 .871<br />

Perceived ease of use (PEOU) .911 .911<br />

Perceived usefulness(PU) .948 .948<br />

System quality(SQ) .875 .876<br />

Information quality (IQ) .895 .895<br />

Service quality (SVQ) .899 .899<br />

User satisfaction (US) .912 .912<br />

Attitude (AT) .910 .911<br />

Intention to sse (IU) .952 .952<br />

Total .979 .979<br />

Discriminant and convergent validity<br />

Convergent validity tests whether the correlations between measures of the same factor are different from zero and<br />

large enough to warrant further investigation of discriminant validity. Given the empirical results shown in Table 2,<br />

attitude (AT) and intention to use (IU) achieve a significant correlation (r=.872, p

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