Flipped Classrooms -- Continuing

Progress (in some direction) continues... we see Yahoo News (from AP) on students whose Teachers flip for 'flipped learning' class model:

spend class time doing practice problems in small groups, taking quizzes, explaining the concept to other students, reciting equation formulas in a loud chorus, and making their own videos while teacher Crystal Kirch buzzes from desk to desk to help pupils who are having trouble.
It's a technology-driven teaching method known as "flipped fearning" because it flips the time-honored model of classroom lecture and exercises for homework — the lecture becomes homework and class time is for practice.
... the online community Flipped Learning Network now has 10,000 members, up from 2,500 a year ago, and training workshops are being held all over the country...
Under the model, teachers make eight- to 10-minute videos of their lessons using laptops, often simply filming the whiteboard as the teacher makes notations and recording their voice as they explain the concept. The videos are uploaded onto a teacher or school website, or even YouTube, where they can be accessed by students on computers or smartphones as homework....
"The first year, I was able to double the number of labs my students were doing," Sams said. "That's every science teacher's dream."
In the Detroit suburb of Clinton Township,...Flipping yielded dramatic results after just a year... Green attributed the improvements to an approach that engages students more in their classes. ....
The concept has its downside. Teachers note that making the videos and coming up with project activities to fill class time is a lot of extra work up front...
Explaining to adults that homework was watching videos was a little harder, though. "My grandma thought I was using it as an excuse to mess around on the Internet," Nguyen said.

Note that "making the videos" is to some degree a one-time cost; videos are shared to similar classes. The "buzzes from desk to desk" teacher-activity should to some extent be a slightly-older-student activity, as suggested by the "explaining the concept to other students" which precedes it. And "coming up with project activities to fill class time"...well, that's also to some extent a one-time cost. Hmm.
Then again, maybe not.