Withitness (Kounin, 1970) — "the teacher's awareness of student behavior in all areas of the classroom at all times." Hold SHIFT to become aware of student behavior in all areas of the classroom at all times.
It costs Bandwidth. The lesson does not pause while you use it. And your furniture casts blind spots — the cabinet and the bookshelf hide what is behind them, so some things can only be seen from somewhere else in the room.
Mastery is not a bar you fill. It is the average of what twelve people understand, and each of them has their own number. Deliver from the front strip and those numbers climb. A kid with a phone under the desk is not learning anything, which is what the phone is actually costing you.
Check for understanding to see the comprehension aura in Withitness. It goes stale in about a minute. You are always deciding whether you have time to know.
Someone with a clipboard visits some periods and not others. Sometimes it is on the calendar days ahead; more often it is nine seconds of warning. Either way the rubric she brought will tell you what it wants, and it is not the same five things every time.
First, the seating chart. Drag a name onto another name. Where somebody sits decides who they can reach, who settles them, what you can see from the front, and how much of you they get. None of that is written on the chart. You learn it by teaching them, and it is still there next period.