It’s best to create notes which are only about one thing—but which, as much as possible, capture the entirety of that thing.
This way, it’s easier to form connections across topics and contexts. If your notes are too broad, you might not notice when you encounter some new idea about one of the notions contained within, and links to that note will be muddied. If your notes are too fragmented, you’ll also fragment your link network, which may make it harder to see certain connections. Evergreen notes should be densely linked
There’s no clear litmus test or correct answer here—just a bunch of tradeoffs.
The notion is quite similar to the software engineering principle of separation of concerns, which suggests that modules should only be “about” one thing, so that they’re more easily reusable. But likewise, if you fragment modules too much, you’ll have a cohesion problem. In this way, Evergreen note titles are like APIs.
The underlying principle I’d call the principle of atomicity: put things which belong together in a Zettel, but try to separate concerns from one another. For example, I might collect a list of assumptions in one Zettel which serves as an overview. like hard determinism . A related argument and its conclusion will be kept in another Zettel. Moral responsibility under hard determinism is a good example. I can re-use the arguments without buying into the assumptions because the arguments are of sufficiently general form. Atomicity fosters re-use which in turn multiplies the amount of connections in the network of Zettels.
Evergreen notes are written and organized to evolve, contribute, and accumulate over time, across projects. This is an unusual way to think about writing notes: Most people take only transient notes. That’s because these practices aren’t about writing notes; they’re about effectively developing insight: “Better note-taking” misses the point; what matters is “better thinking”. When done well, these notes can be quite valuable: Evergreen note-writing as fundamental unit of knowledge work.
It’s hard to write notes that are worth developing over time. These principles help:
This concept evolves in large part from Niklas Luhmann’s Zettelkasten, which he regards as the independent intellectual partner in writing his 70 books. See Similarities and differences between evergreen note-writing and Zettelkasten
Ahrens, S. (2017). How to Take Smart Notes: One Simple Technique to Boost Writing, Learning and Thinking – for Students, Academics and Nonfiction Book Writers.
Many students and academic writers think like the early ship owners when it comes to note-taking. They handle their ideas and findings in the way it makes immediate sense: If they read an interesting sentence, they underline it. If they have a comment to make, they write it into the margins. If they have an idea, they write it into their notebook, and if an article seems important enough, they make the effort and write an excerpt. Working like this will leave you with a lot of different notes in many different places. Writing, then, means to rely heavily on your brain to remember where and when these notes were written down.
Luhmann, N. (1992). Communicating with Slip Boxes. In A. Kieserling (Ed.), & M. Kuehn (Trans.), Universität als Milieu: Kleine Schriften (pp. 53–61). Retrieved from http://luhmann.surge.sh/communicating-with-slip-boxes