Edssential article from @Kris_Boulton :
Use exit tickets to get a snapshot of what every student took away from your lesson
This is the single most powerful thing I’ve done all year, from lesson one, maintaining it consistently, and it’s impressed external observers and internal mentors alike.
The exit ticket provides a snapshot of whole class understanding for each and every lesson, in under two minutes. For effort to impact ratio, they’re a no brainer. I can’t even imagine planning the next lesson without them.