One must come to the discussion with an open mind , willingness to share and desire to learn . Don't assume you have the final solution before the discussion starts, or that your views are superior to others in the group. Don't check your opinions at the door . Others are interested in what you have to say. They may not agree with your point of view, but they will want to read your notions and certainly, at this level, respect your contribution.
Many minds working together can throw a great deal of light on an issue or problem.
Try to be objective and brief in presenting your point of view. Introduce only one point at a time. Be willing to accept criticism of your ideas. Do not try to force the WBB to agree with your views or try to defend your position at all costs merely because it is your opinion. We all have opinions, but in graduate school we should come with facts and research to back our views.