Like I've said before. It comes down to how you want to play the challenge. Do you follow the old easier guidelines or the reviewed stricter ones? How strictly do you want to follow them? Some Simmers just use the guidelines as a jumping off point for an idea and keep a few of the rules and adding some of their own.
Edit:
:oops: Sorry everyone. I've been playing in the new site (**its a great place, come on over and play too :D ) and didn't realise that I've just "said this before" in the last few pages of posts
**Link
http://secretsimsociety.pcriot.com/index