Usability goals
All goals are predicted to be measured in low-fi prototype, therefore the time measure is prolonged.
1.
- It takes a user 20 seconds to change the font to another font -- Failed
- 95% of users will finish changing the font to another font -- Success
- Users will grade their satisfaction for changing the font to another font above 4 on average on a scale from 1-5 -- Failed
| Usability factor |
Data collected |
Worst Case |
Preferred Case |
Best Case |
Value Now |
| Efficiency |
Time for changing to another font |
1 minute |
20 seconds |
10 seconds |
23 seconds |
| Effectiveness |
Finished tasks |
65% finished |
95% finished |
100% finished |
100% finished |
|
Completed |
Time |
Number of commands |
Number of misunderstandings |
Satisfaction |
| Student 1 |
Y |
30 sec |
7 |
2 |
2 |
| Student 2 |
Y |
20 sec |
5 |
1 |
4 |
| Student 3 |
Y |
23 sec |
7 |
1 |
4 |
| Student 4 |
Y |
20 sec |
6 |
1 |
5 |
2.
- It takes a user 15 seconds to change the background to white -- Success
- 90% of users will finish changing the background to white -- Success
- Users will grade their satisfaction for changing the background to white above 4 on average on a scale 1-5 -- Success
| Usability factor |
Data collected |
Worst Case |
Preferred Case |
Best Case |
Value Now |
| Efficiency |
Time for changing to another font |
30 seconds |
15 seconds |
10 seconds |
13 seconds |
| Effectiveness |
Finished tasks |
70% finished |
90% finished |
100% finished |
100% finished |
|
Completed |
Time |
Satisfaction |
| Student 1 |
Y |
16 sec |
5 |
| Student 2 |
Y |
12 sec |
5 |
| Student 3 |
Y |
10 sec |
5 |
| Student 4 |
Y |
12 sec |
5 |
3.
- It takes a user 10 seconds to highlight a block of text and generate a summary -- Success
- 80% of users will finish highlighting a block of text and generate a summary -- Success
- Users will grade their satisfaction for highlighting a block of text and generate a summary above 3 on average on a scale 1-5 -- Success
| Usability factor |
Data collected |
Worst Case |
Preferred Case |
Best Case |
Value Now |
| Efficiency |
Time for changing to another font |
1 minute |
10 seconds |
5 seconds |
7 seconds |
| Effectiveness |
Finished tasks |
50% finished |
80% finished |
100% finished |
100% finished |
|
Completed |
Time |
Satisfaction |
| Student 1 |
Y |
8 sec |
5 |
| Student 2 |
Y |
9 sec |
5 |
| Student 3 |
Y |
6 sec |
5 |
| Student 4 |
Y |
5 sec |
5 |
User experience
- Average score on the question below is 4 or greater
- How well or poorly, on the scale 1-5 has ReFormer enhanced your reading abilities?
Goal succeeded: 4,5
- Average score on the question below is at least 4,5
- How easy or difficult, on the scale 1-5 was it for you to change the font size to your preferred settings?
Goal succeeded: 5
- Average score on the question below is at least 4
- How likely or unlikely, on the scale 1-5 would you recommend others to use ReFormer?
Goal succeeded: 4,75