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A mind map is usually done by one person although it could be used to collect ideas from a group brainstorming session. A mind map is a diagram of ideas which are interconnected in a hierarchical structure.
Initially a main topic is written down in the centre of a sheet of paper or on a white board (or other surface). Then the initial ‘base ordering ideas’ are written down usually by asking the 5 W’s and H, and then using the answers to those questions as the first branches.
Tony Buzan, the originally inventor of the style of brainstorming known as mind mapping advocates uses colours and drawn images. The first order branches should be made larger and the text large and emboldened to indicate the hierarchy.