A group of people are made to site together in aoom . There will be a person  co- ordinating the GD.After the topic is given , the candidates start disussing the topic amongstthemselves . They stop the discussion when the moderator asks them to stop .In some cases , you may be asked to write the summary of the GD. hence while taking the others are saying you should at the same time concentrate on what the others are saying, so that it is easy to write others point of views . dont be in a wrong impression that writing a summary means it is mandatory that you have to come to a conclusion by the end of the allotted time for gd .This is not so even if you are asked  to come to a conclusion, it is not always possible . In  such cases the moderator will look for your approach to the problems and not your prescription tn the form of consensus.