Usability factor | No. of items | Cronbach’s alpha* | Cronbach’s alpha** |
Learnability | 4 | 0.775 | 0.811 |
Efficiency | 6 | 0.872 | 0.772 |
Effectiveness | 4 | 0.857 | 0.778 |
Satisfaction | 2 | 0.677 | 0.690 |
Errors | 2 | 0.740 | 0.706 |
Privacy | 2 | 0.771 | 0.737 |
Design | 2 | 0.702 | 0.712 |