Let's teach for mastery -- not test scores | Sal Khan
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Sal Khan asks what happens after a test identifies a gap. A fixed calendar can carry a known misunderstanding into the next unit. Mastery learning holds the proficiency criterion steady and lets time vary.
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And even though the test identified gaps in our knowledge, I didn't know 25 percent of the material.What's variable is when and how long a student actually has to work on something, and what's fixed is that they actually master the material.