Graph theory
The concept map is a form of a semantic network or semantic graph. It is formally based on graph theory. In the concept map, concepts are represented by nodes. The relationship between nodes are represented by "typed links" or "edges". (See Graph theory.) In creating a map or graphic representation of what is known an individual intentionally interacts with the graphical interface or map and through a reflective process adds nodes (concepts) and /or adds relationships (edges or typed links) or modifies existing node-relationship-node instances. It is likely that the process of engaging with concepts and relationships between concepts brings about the creation of understandings as well as making the understandings explicit.