Students enroll in online courses so they can attend class according to their schedule not according to the school's schedule or the instructor's schedule.
We have "office" hours so that students can talk with the instructor face-to-face. We use Webex for that purpose. Even though the student and instructor meet one-on-one, they meet face-to-face and synchronously. These meetings are good for a social presence of the instructor.
We also have optional synchronous events that are recorded through Webex. Perhaps 8 in a class of 80 attend. Usually the same ones attend, too. Times for the events are best scattered throughout the day so that students from all over the world and all walks of life can attend. These meetings are likewise good for the instructor's social presence.
The instructor will have an agenda--maybe two items to cover. This is in case no one asks anything. Dead air time is not good. Purposeless talking is not good either.
The recording is added to Canvas in a link--usually the next module. The other students can view the meeting at their leisure. No requirements are met by students. Our modules are usually weekly in our 101-109 courses.
Sometimes a teaching assistant will conduct the meeting or the "office" hour. The teaching assistant might have their own meeting or meetings. Multiple teaching assistants in a course will meet with their section.
As a course designer and technologists, I have sat in on these meetings to assure that Webex goes well. Some instructors are intimidated with Webex.
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