These works indicate that based on their theoretical model for the comprehension of scientific texts, the reader needs to be able to identify key concepts and be able to understand how they relate to each other. While these sources do not discuss concept maps, they do highlight some of the design components or beneficial features of a concept map as methods that can help a reader understand a text. In particular, scientific texts can use signaling to help coativate related concepts for a reader. Many of the methods of signaling are things that concept maps use.