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I was confused because I wasn't sure what the goal of the lesson was.  Was I suppose to have a clear understanding of the size of a water molecule or was I suppose  to see how objects compare along a different scale? So since I'm not clear on the goals, I would like to be assessed on my interaction and engagement with my group. I also would assessed on measurement. I then would probably have  my class write an reflection of the day's lesson and their understanding of the lesson.  As a teacher I could see what worked and what didn't. I would use it as a assessment of me as a teacher. For the students I would see who undersood the lesson and who didn't. I would use this lesson and their feedback to further develop other lessons.