Buzz group is an attempt to refine the brainstorming concept. It is developed by Dr. J. Donald Philips. According to him , the aggressive individuals dominate the group sessions and this holds back the colleagues. It hampers the free flow of ideas. To overcome this limitation, he suggests that the group be subdivided into clusters of six. Each cluster is given a limited  time of six minutes to throw up the ideas. Such a subdivision isolates the ‘ bullies ‘ to some extent. The time pressure makes the timid to open up. The buzz group is criticised as it gives only six minutes to generate ideas which may not be enough.