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Now I see that when students are taking input from the situation I set up for them, that there can be many many variations in what they get. I need to check more often and more carefully to see what it 'looks like' in their head. I know what I would like it to look like, at least most of the time. No matter how carefully I show, or arrange for students to do, concepts or skills their brains are only catching the edges and filling in the substance based on their own architecture. Regards,