He and I talked further about whiteboarding. I shared with him some of my concerns about students not preparing for the day's whiteboarding because they didn't do their homework (no attempt). He had many suggestions: time limits, two grades (first is just attempt, 2nd is how much learned), assessment.
I like the idea of using a count down timer and some sort of concluding formative assessment to keep students on task and invested in the learning event. Need to look into rubrics for these. Back to the workshop . . .