Herman Martinus on mnemonics:
There’s a study with the mouthful of a title Retrieval Practice Produces More Learning than Elaborative Studying with Concept Mapping by Karpike and Blunt (2011) that I read this morning where they had college students read short educational texts, then study them in different ways: rereading, building concept maps while looking at the text, and free recall (reading once, then writing down everything they could remember on a blank page without looking at the source material).
On a delayed test about a week later they found that free recall produced better information retention than rereading or creating a concept map.