In the Visible Learning for Teachers, Hattie (2012) argues that the self-evaluation effect size is 0.62. What does this value mean?

Reflective Reading – Metacognition
It has been shown that almost any teaching strategy has an effect size above zero.
In the Visible Learning for Teachers, Hattie (2012) argues that the
self-evaluation effect size is 0.62. What does this value mean? How does
self-evaluation constitute a metacognition strategy and an opportunity for
students to learn? How do you engage your students/patients in self-evaluation? Explain how you plan to incorporate metacognition strategies into your teaching practices. How can you frame your mind around metacognition and learning?

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