Design
USER ACCOUNT 
In the final design, we added a login (with registration for new users) because of feedback we wanted to give users of students they’ve emailed before. We needed this specific to user so we created accounts.
MAIN PAGE
This is the main page of the search system. 
In regards to the placement of everything, we hadn’t received any negative feedback and so although we’ve gone through iterative changes, the mains earch page layout has not changed much.
SEARCH INPUT 
A lot of the feedback we received from the heuristic evaluation and user testing was that the autocomplete for the search did not do what users expected. Originally we had autocomplete filled with choices to suggest what the user meant. For example when the user typed in “6.813, 6.02” it would drop down with choices of either “6.813 OR 6.02” and “6.813 AND 6.02”. We presented that functionality in a different way (explained below) and left autocomplete to just complete the classes which is what our users expected with autocomplete.
To address the issue of unclear search requirements, we then moved everything to a pop-up that allowed users to select what they meant. 
This is now used to clarify symbol confusions: using commas, spaces or such. We realize we still needed this functionality is some form, so we decided to separate it from the autocomplete function otherwise the list of suggestions would be growing exponentially.
HIDE
Another feature we had was the ability to “hide” a student from the list of matches. We added this capability for users who just wanted to clean up the students they had to look through. 
We went to several iterations until we gave enough feedback to users. We had the “Undo” button on the top for the most recent “Hide” action. We also had a counter of how many students were hidden at a time on the top right. And clicking that button (which was only enabled when there was at least 1 student hidden) would pop up with a list of students that the user can now restore.
MATCH FILTERING/SORT 
From user testing, we received feedback that called for being able to filter by year as well as a more clear way of sorting students. So we added settings that allow user to customize what they see.
EMAIL 
One thing we could never get around was a way to distinguish all of the capabilities available, where users can 1. Hide 2. See Details and 3. Email. Only 1 and 2 are available student by student with just one click. Where for 3, emailing, users need to select a student and then click the email function. This is an advantage for users who like to email several students at once and so can go through and continue selecting students in between other actions. The problem is this is a tradeoff for users who like emailing student by student and sometimes is confused by the need to select one student then email, and repeat this process for each student.
The email pop-up hasn’t changed much either but we do make the subject and message fields required in order to send. There is also explicit feedback that what a user types will be saved and then closed with the “Save and Close” button.
Now, not only is there feedback that the email has been sent successfully, but the system also tracks when was the last time a student was emailed. This is the reason why we added the user accounts mentioned above. 