Zettelkasten (“note box” in german) refers to any information management system that uses a card indexing to manage information. For the purposes of this forum, I am using the word to mean either Niklas Luhmann’s card index or the digital implementation of his ideas.

Further Research

I haven’t read all of these articles, so I’m not sure how valuable they actually are

Each of Niklas Luhmann’s zettelkastens consisted of two collections of paper slips. The first was his notes collection which contained an index and large collection of interconnected notes. The second collection was the bibliographic information of the books he notes on.

His Two Zettelkastens