- Aug 2021
Another theoretician of the index card system, the German sociologist Niklas Luhman, whose so-called "Zettelkasten" (slip-box) has achieved independent fame in Germany, used to talk about this first analytic step as "reduction for the sake of [building] complexity." 
Luhmann used the idea of "one card, one fact" as the first step of "reduction for the sake of [building] complexity."
Historically reducing things to their smallest essential form or building blocks makes it much easier to build up new complex things from them.
Examples of this include:
- Reducing numbers to binary 1 and 0
See Luhmann, Niklas (2000) Short Cuts. Edited by Peter Gente, Heidi Paris, Martin Weinmann. Frankfurt/Main: Zweitausendeins), p. 33.