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At the moment, we seem to be resorting to bribery for homework, as in "If you get your homework done by X time, we will go to the park, or climbing wall afterward." So, for housework/chores we are forced to do a reverse-bribery: "If you don't tidy your room, you will not get to watch X Factor tonight."
I hate that it comes to this, however, it is somewhat useful in teaching about responsibilities v. treats, time management and frankly, who's boss.