I can't stand it! How many people are pertinent to discuss a technical issue? When my boss and I mapped out our team management, we haggled over trivial thing like above question. He insited on limiting the number less than or equal to four. To the contrary, I insisted that the number of people doesn't matter. Seven people would be still acceptable. Small number might be preferable to deeply discuss. However I can't understand such a limit should be applied. I believe that a chairperson, though I always play a role as, should/can facilitate the meeting. What a weird boss he is!!