[Excessive finger abuse at this weekend's conference (cf., Brit's timeline on Facebook, Saturday, September 15, 2012) warrants this reposting of my old blog post from Lemmings, January 17, 2008]
There are many different theories about how best to chair a session. Disagreement arises in particular when it comes to the principles for determining the order in which people get to speak. Some will simply put people on the list in the order that they see them raise their hand---but remember, seeing is theory-laden. Others will invoke more sophisticated principles, for instance, pick people in the back before picking people in the front or pick people to the left before picking people to the right, and so on. In Arizona Agustin Rayo (aka 'Augustin Reyo') would punish people who raised their hands one second too late (the slow ones didn't get to ask follow-ups, etc.), and Ned Markosian put people whom he thought had already spoken too much in earlier sessions at the end of his list. Both Agustin and Ned were punished for these practices. Here is a picture of Agustin being punished.