Mind-mapping or Diagramming

Mind-mapping (or diagramming) is a technique for brainstorming and visualizing the relations between words or ideas. Wikipedia has an article about mind-mapping. There is also a Japanese [日本語]version. I don't agree with everything it says, though. If you are interested in using computer software to make a mind-map, there are lists of free and commercial software that is available to download and use. Mindmapping.org is an organization that discusses and promotes various uses of mind-mapping.