Ahrens goes through a variety of research on teaching and learning as they relate to active reading, escaping cognitive biases, creating understanding, progressive summarization, elaboration, revision, etc. as a means of showing and summarizing how these all dovetail nicely into a fruitful long term practice of using a slip box as a note taking method. This makes the zettelkasten not only a great conversation partner but an active teaching and learning partner as well. (Though he doesn't mention the first part in this chapter or make this last part explicit.)