Brainstorming is a process for generating creative ideas and solutions through intensive and freewheeling group discussion. Every participant is encouraged to think aloud and suggest as many ideas as possible, no matter seemingly how outlandish or bizarre. Analysis, discussion, or criticism of the aired ideas is allowed only when the brainstorming session is over and evaluation session begins. In brainstorming, efforts are made to find a conclusion for a specific problem by gathering a list of ideas spontaneously contributed by its members.
The term was popularized by Alex Faickney Osborn in the 1953 book Applied Imagination where he began developing methods for creative problem-solving back in 1939.