Four-stage brainstorm

The paper proposes the four-stage brainstorm, which removes the number of deficiencies of many other brainstorm modifications. The proposed modification allows to increase the brainstorm effectiveness by increasing the contribution of preparatory stage and adding the fourth stage, in which the possibility of problem definition reformulation, on the basis of information obtained at the previous stages, is provided. Furthermore, the responsibilities of leaders of the second and third stages are extended and thoroughly prescribed.