Scads or Skill Challenge As Disease Systems has been updated a bit. What I added was the ability to have Required Skills per challenge. The party must succeed at least once at these skills per round or things other than normal failures and successes happen.
As an example which I do promise to put in there, just too busy at work today to do any non-work. Anyway a local tribe of goblins has kidnapped the farmer’s daughter. The party is hot pursuit and the DM has decreed a Skill Challenge is afoot. He quickly decides each round he wants a successful Stealth check and a successful Perception check.
On a round that there is no stealth check made the goblins are aware of the party trailing them and will lead the party to an ambush. He further decides that when this happens the party gets to make Insight checks outside the framework of the skill challenge to see if they figure that out. In addition any round that doesn’t have a successful Perception check the party will lose the goblins trail. To pick it up again in each succeeding round they’ll need to reaquire the trail but this will incur a cumulative +5 penalty to the DC. We can hope they pick it up quickly or the daughter may become cauldron bait.