The core of the process revolves around two collections of notes - Reference Notes which summarise source material and include a link to the source, and the collection of evergreen notes which are written in the interpretive part of the process.

The 20th-century German sociologist Niklas Luhmann managed to publish 70 books. He credits much of his success to his Zettelkasten, or "slip box."

_Luhmann, N. (1992). Communicating with Slip Boxes. In A. Kieserling (Ed.), & M. Kuehn (Trans.), Universität als Milieu: Kleine Schriften (pp. 53–61). page _