Originally Posted by Val
The primary reasons for my suspicion about the effectiveness of this method are that:

1. Students can't raise their hands during a video lecture and say, "Wait, I didn't get that." Pressing the rewind button will not always work in this situation.

But they can ask those questions the next day in class.

Originally Posted by Val
2. People seem to be jumping into this method without any solid evidence for its effectiveness.

You can't gather that evidence without putting it into practice somewhere, though.

My primary concerns would be:

1) This method, widely deployed, would eat up all the students' time outside of school. It also creates inefficiencies in the use of school time, because a student who gets it from the previous night's lecture can complete the assignment in 15 minutes, but it still stuck in class for the full 50 minutes.

2) Failure to view the lectures outside of school would be a widespread problem, leaving teachers to re-teach the material to those who skipped, and short-changing the students who didn't.