An example of problem solving from the Team Fortress 2 team

Theme/Goal: "improve the player experience around finding a server to play on"

Current Condition: "master servers need to ask a game server for its details, and that server can lie to us if it wants to"

Analysis:

• "scoring system had to penalize lying without penalizing custom game rules, because some players like custom game rules"
  
• "system needed to work entirely from data that didn't come from the servers themselves, so they couldn't lie to us in any way to affect it"
  

Solution...

http://www.teamfortress.com/post.php?id=2338