Interview and Q&A with Sönke Ahrens on How to Take Smart Notes

Sönke Ahrens’ core message is that “smart notes” are less about building the perfect filing system and more about using an external brain to think more clearly—especially by making ideas explicit, connecting them over time, and challenging confirmation bias. The system is designed to support complex thinking: notes become a working environment where new information can be compared against what was previously believed, forcing writers to notice contradictions and refine their understanding.

Ahrens frames the book as both a personal productivity project and a practical outgrowth of his academic interests. While working on a new book, he struggled to find tools that helped him write and retrieve ideas reliably. That frustration led him to the Zettelkasten tradition, which he connects to a philosophy of education and “thinking outside the brain.” The goal isn’t just to collect more material; it’s to reduce the pain of forgetting how one arrived at an idea and to make it easier to see differences by comparing notes across time. He also argues that note-taking can function as a built-in challenge mechanism: by externalizing thinking, it becomes harder to stay trapped in one’s current mental state.

Ahrens also pushes back on a common academic assumption about how knowledge work should proceed. Higher education often treats learning as a linear process—form a hypothesis, then execute—whereas he favors a more open-ended approach that can change as thinking evolves. Technology, in his view, can help implement that openness by lowering friction for revisiting and reworking ideas.

When asked how to get students to write more notes, Ahrens says the hardest part is cultural: students who haven’t yet faced thesis-writing often don’t feel the urgency. His workaround is social and motivational—pair younger students with older ones who can credibly describe the real struggles that appear later. He also emphasizes that students don’t need a “perfect system” early on. The system should be adjusted as writing becomes clearer; the learning curve—notes that are too extensive at first, then too short, then refined again—is part of the process rather than evidence of failure.

Ahrens addresses misconceptions about step-by-step instructions and software rigidity. He warns against trying to copy a prescribed workflow or migrating everything at once. Instead, he recommends starting with what feels comfortable, beginning from existing projects or topics, and keeping hierarchy flexible rather than hardwired. He also argues that note-taking should be adaptive: sometimes the right move is to take no notes, sometimes it’s to write briefly, and sometimes it’s to spend time rephrasing—depending on what the text demands.

On the “context vs. subject” principle, Ahrens distinguishes collections from context: filing should prioritize the content-level difference a new note makes to prior beliefs, not just keyword organization. That content-dialogue approach is meant to accelerate the moment when information either supports, contradicts, or forces revision.

Finally, he rejects memorization techniques like spaced repetition as a general educational strategy, claiming that genuine understanding creates enough connections that memorization becomes unnecessary. His broader frontier is how to be open-minded without being pulled into filter bubbles or partisanship—an issue he ties back to the need for environments that make fundamental mindset change more likely.