Brainstorming by mindmaps.
MIND MAP: A mind map (or mind-map) is a diagram used to represent words and ideas linked to and arranged radially around a central key word or idea. It is used to generate, visualize, structure and classify ideas, and as an aid in study, organization, problem solving, and decision making.
a recommendable open source tool to creat mind-map like diagrams.
MAPPE MENTALI E SCRITTURA (di U. Santucci)