Over the years, I have argued often on this blog that one of the really weak spots in education was the failure of students to close the holes on what I call �Swiss Cheese Knowledge.� Thus, on the first day of class last week, I drew a block on the board and put holes in it. I then explained the drawing to my students. When you leave class every day, your knowledge looks like a block of Swiss cheese. It appears entirely solid. However, it is full of holes�things you missed, things you misunderstood, things you did not quite catch. I know the knowledge feels solid, but it really is not. If you do not take action, those holes just get bigger as time passes and your memory begins to fade. Having taught for nearly 50 years, I know where the holes are likely to be. I can and will write test questions to expose those holes. In many ways, testing is just an attempt to measure the quantity and size of the holes ...
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