I did not come up with either of these ideas but I implemented a modified version combining both ideas last year. I pinned a print-out of both to our bulletin board in the kitchen, where we keep our school calenders and write in all of our activities etc. It has worked surprisingly well. My kids feel that they have some control over their life and I have to play the "bad guy" less often.
Congratulations: You got Grounded!
To get ungrounded, you must earn 500 points.
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How Not To Get Grounded