"Concept mapping creates a visual representation of the relationships among a set of targeted topics. The goal of concept mapping is to create an actual map where the concepts are represented as nodes and the relationships between them are represented as lines that link those nodes."
Morgan, D., & Guevara, H. (2008). Concept Mapping. In Lisa M. Given (Ed.), The SAGE Encyclopedia of Qualitative Research Methods.(pp. 109-110). Thousand Oaks, CA: SAGE Publications, Inc.