What classroom walkthrough software is, and what actually makes walkthroughs work: the kinds of tools, why frequent short visits beat one long observation, and why the write-up is the bottleneck that decides whether walkthroughs stick.
What to look for in the first five minutes of a classroom walkthrough: not the teacher, the learning. What the students are doing, what the room reveals, what the teacher's decisions show, and what the lesson says about the weeks before it.