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Quote Dawn Andersen-Lux

Playing "Loud or quiet" is a good way to grab the attention of younger children, teach behaviour-related vocabulary and, at the same time get them to let off steam.

That's always a great focusing activity

Here is a podcast on teaching children and there's some info in there on crowd control
ESL Teacher Talk » Blog Archive » Teaching Children vs. Teaching Adults

Here's another one and the guest Richard discusses some of his methods for handling large groups and the game of the week is a 'game' to get students into groups.
ESL Teacher Talk » Blog Archive » Getting ‘Genki’ With It