[[The Cave Wall]] Benjamin Bloom was an educational psychologist, famously introducing 3 main concepts to the world of learning and pedagogy : 1. (Revised) [Taxonomy](https://en.wikipedia.org/wiki/Bloom%27s_taxonomy), 2. [Mastery Learning](https://en.wikipedia.org/wiki/Mastery_learning) 3. [2 Sigma Problem](https://en.wikipedia.org/wiki/Bloom%27s_2_sigma_problem). I highly recommend you take a gander. I've found these ideas quite though-provoking and powerful.