## 4 Results
### Effectiveness
Therefore, this result may lead the developers to find alternative ways to reduce the time needed to accomplish this task. In addition, we found that the participant who has good experience accomplished all the tasks with the least overall time (29 min). In the iEN system, the VI participant completed the task in the least amount of time compared to other participants, while two blind participants took more time to try but did not complete three tasks. In addition, one participant completed all tasks in 49 min because they had previous experience in using the system. Satisfaction  
Satisfaction was assessed using observation notes, user comments, and open-ended questionnaires, as well as the quantitative data collected using Likert scale ratings. Table 12 presents the satisfaction results, where most of the participants were happy and confident during the log-in task, as it is an easy and common task. However, they were confused and anxious about the rest of the tasks. Therefore, as one of the important goals of the study was to understand and gather users' comments and feedback, we present our collected observations during the test sessions. The aim behind this was to assess their satisfaction and to identify the barriers faced when using the three systems. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**System** & **Task** & **P1** & **P2** & **P3** & **P4** & **CT in Min** \\ \hline \multirow{3}{*}{[PERSON]} & Task 1 (Log in) & 5.5 & 2 & 2 & NC & 3.16 \\  & Task 2 (Enter skills/grades) & 5 & NC & NC & NC & 5 \\  & Task 3 (Borrow a book) & 3.5 & NC & NC & NC & 3.5 \\ \hline \multirow{3}{*}{[PERSON]} & Task 1 (Log in) & 3 & 3 & 8 & 2 & 4 \\  & Task 2 (Request a vacation) & 18 & 21 & 27 & 22 & 22 \\  & Task 3 (Request a salary identification) & 8 & 10 & 12 & 11 & 10.25 \\ \hline \multirow{3}{*}{iEN} & Task 1 (Log in) & 6 & 15 & 7 & 11 & 9.75 \\  & Task 2 (Download course content) & 13 & NC & 14 & NC & 13.5 \\  & Task 3 (Play interactive content) & 17 & NC & 18 & NC & 17.5 \\  & Task 4 (Search for a course plan) & 12 & NC & 10 & NC & 11 \\ \hline \hline \end{tabular}
\end{table} 
Table 11: Average completion time (CT) per task for each system in minutes. First, the incompatibility with the screen readers was the main issue that users mentioned in all systems, as the screen reader could not read the forms' labels, the dropdown menu choices, or the buttons. According to our investigation, this issue can happen for two reasons. First, these features miss some attributes, such as the \"tabindex\" attribute and the ALT attribute, or some elements, such as form labels. Second, there was improper usage of some elements, such as \"input,\" \"label,\" \"option,\" and \"select,\" and defining them within many levels of nesting elements. This can be considered a very critical problem since it prevented the participants from completing the tasks successfully. We observed that because of this problem, the participants were entering arbitrary grades just to complete the \"enter skills/grades\" task in the Noor system and refusing to complete the last three tasks in the iEN system. Second, the log-in task was a common task for all systems and could be considered as one of the easiest tasks for the participants; however, all of the users expressed their disappointment because no audible CAPTCHA alternative was provided. In the same task, we noticed that even the labels of the forms were unreadable by the screen reader; all participants were able to complete the task. As for the Noor system, the VI participant who used the mouse for navigation ended up using the tab key because the navigation elements were unreadable by the screen reader when using the mouse. She stated that the \"Noor system should support every type of input, including the mouse because it is easier for me.\" Another participant suggested changing the navigation of the Noor system to a hierarchy and replacing it with fewer options and elements.