What is Ability grouping?
What is Elaborative interrogation?
Some time ago I discovered the Visible Learning MetaX-tool which gives you easy access to the work of John Hattie. In the tool, you can check the effect sizes for a lot of different approaches and influencing factors in education together with the sources that back this claim, combined with a confidence score.
But… you can also find this: a 22 page glossary explaining all the influences, which is nice and handy!