More effective than what? Just highlighting? What does Ahmad show? Is there a hierarchy of strategies that have been cross tested with larger groups? What effect does a depth and breadth of neurodiverse subjects show, for example?

This is the my first encounter with REAP.

REAP is an acronym for Read, Encode, Annotate, Ponder.

Has anyone done direct research on commonplacing or zettelkasten techniques to show concrete data to compare them with other currently more popular techniques like Cornell notes or REAP?

Read for potential methods and set up for a potential meta study: Ahmad, S. Z. (2019). Impact of Cornell Notes vs. REAP on EFL secondary school students’ critical reading skills. International Education Studies, 12(10), 60-74