<p>
</p>
<ol>
<li><p>The waitlisted people are waiting for a specific discussion or lab time, even though there is space in the lecture.</p></li>
<li><p>The course has priority enrollment based on major, class standing, etc., and the waitlisted people are in the lower priority groups who will only be enrolled in the course after all of the people with priority due to major, class standing, etc. have enrolled.</p></li>
</ol>