Concept map

A concept map is a diagram that depicts suggested relationships between concepts. It is a graphical tool that designers, engineers, technical writers, and others use to organize and structure knowledge.
A concept map typically represents ideas and information as boxes or circles, which it connects with labeled arrows in a downward-branching hierarchical structure. The relationship between concepts can be articulated in linking phrases such as causes, requires, or contributes to.
The technique for visualizing these relationships among different concepts is called concept mapping. Concept maps have been used to define the ontology of computer systems, for example with the object-role modelling or Unified Modelling Language formalism.
Concept maps are rather similar to topic maps in that both allow to concepts or topics via graphs. Among the various schema and techniques for visualizing ideas, processes, and organizations, concept mapping, as developed by Joseph Novak is unique in its philosophical basis, which "makes concepts, and propositions composed of concepts, the central elements in the structure of knowledge and construction of meaning."(Novak, J.D. & Gowin, D.B. (1996). Learning How To Learn, Cambridge University Press: New York, p. 7.)
Both concept maps and topic maps can be contrasted with mind mapping, which is often restricted to radial hierarchies and tree structures. Another contrast between concept mapping and mind mapping is the speed and spontaneity when a mind map is created. A mind map reflects what you think about a single topic, which can focus group brainstorming. A concept map can be a map, a system view, of a real (abstract) system or set of concepts. Concept maps are more free form, as multiple hubs and clusters can be created, unlike mind maps, which fix on a single two centered approach.
More information on the Wikipedia page , with links to a number of related topics. There is various other coverage on the Web.
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