Zettelkasten
= Zettelkasten
{wiki=Zettelkasten}
Zettelkasten is a note-taking and knowledge management system developed by the German sociologist Niklas Luhmann in the 20th century. The name "Zettelkasten" translates to "slip box" in English, which reflects its original form: a physical box filled with index cards (or slips, known as "Zettel") containing short notes and ideas.