Cathy A,
We tried that same tactic, but it didn't work at all. She really didn't care about missing fun in the evening - the work was just too boring to her. The teacher tried having her do it at recess too, with a similar result. We tried everything last year! And in hindsight, it's a good thing that she was so stubborn about it; otherwise, we wouldn't have gotten her IQ test done and who knows how bad her behavior would have been by now :-)

I definitely agree with your consequence if it works. Sounds like you use Love and Logic too.