It’s the same idea as I (try to) use in teaching Astronomy or Physics (I’m an adjunct Professor at two unis) to undergrads. I try to say something positive before I lambaste their sometimes very avoidable (if they followed instructions) mistakes. It’s easier to do this when the mistakes are honestly due to lack of understanding. Of course, for my online class, when I’m late with grading I tend to get more terse. But at least with their research papers (midterm projects) I am very careful to note something positive before I critique and then hopefully end with something else positive.
This works for all facets of learning, I believe. Self-improvement may come from within and a critique from the perspective of another (hopefully expert) person who finds a way to encourage as well as correct reinforces advancement.
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