What Stood Out
The Zettelkasten method, as Ahrens describes it, is not really about note-taking. It is about deferring the work of connecting. Write down one idea per note, in your own words, and let links accumulate. When you need to write, the structure is already there.
For anyone who has spent a career in operations, the appeal is obvious: it is the same logic as a good safety management system. You do not wait for the accident to organize the data. You capture weak signals continuously, tag them, and let patterns emerge over time.
The Critique
The book’s examples lean heavily on academic writing. Its advice is less directly useful for someone whose output is an operating decision rather than a paper — but the underlying habit transfers cleanly.
A note-taking system is a second brain only if you are willing to do the thinking the first time.
Part of the Book Reviews series — longer notes, takeaways, and critical analysis of books worth reading.