This is a really technical paper (11 page PDF) but one you're not going to want to miss. It introduces "the Topic Transition Map, a general structure that models the educational materials at the topic level. We model a course as a set of topics, and each topic is a set of concepts." The authors consider the question of how instructors order the topics in a course and then attempt to emulate that using four methods (read the first paragraph of the conclusion first to get this gist). This is a hard task because there are two major parts: first, creating a model of the different topics taught in the course, and then second, ordering them in the best sequence. See the diagrams (figures 5-8) to visualize this process. The four methods are evaluated against each other for factors such as clarity of the terms produced and the transitions between topics. (Here's the full list of papers from EDM2021).