http://www.ludism.org/ppwiki/ConsensusFantasy
5. An argument's strength determines what needs to be rolled on a piecepack die for it to happen. Players roll one piecepack die for their own arguments. If they roll any of the target numbers, then the argument happens. (If an argument will always fail or always succeed, they don't roll for it.)
The tables below show how to roll on both standard six-sided dice (d6) and percentile dice (d100) as well as piecepack dice.
Strength piecepack d6 d100 VERY STRONG 2,3,4,5,A 2,3,4,5,6 ≤ 85 STRONG 3,4,5,A 3,4,5,6 ≤ 70 AVERAGE 4,5,A 4,5,6 ≤ 50 WEAK 5,A 5,6 ≤ 30 VERY WEAK A 6 ≤ 15 Piecepack dice have six sides: N 2 3 4 5 A, where N means "null" and A means "ace". In Consensus Fantasy, nulls count as 1 and aces count as 6. N is an automatic failure and A is an automatic success.
If you roll either of these special values, roll again. (But don't roll again when settling competing arguments or conflicts.) If your second roll is another special value, this is what your rolls mean:
piecepack d6 d100 Success? N & N 1 & 1 > 85 & > 85 "No, and..." an extra failure N & A 1 & 6 > 85 & ≤ 15 "No, but..." a positive side A & N 6 & 1 ≤ 15 & > 85 "Yes, but..." a negative side A & A 6 & 6 ≤ 15 & ≤ 15 "Yes, and..." an extra success The gamemaster determines what these results mean by making an argument for an unexpected event. (See Unexpected events.)
Note: Percentile dice work differently from piecepack dice and d6. On piecepack dice and d6, success means rolling over a target number, but on percentile dice, success means rolling under a target number. For example, with a Strong argument on a piecepack die, you have a roughly 67% chance of success, which is greater than or equal to 3 (3, 4, 5, or A). You also have a 33% chance of failure, which is less than 3 (N or 2). On percentile dice, these rolls correspond to a 70% chance of success (less than or equal to 70), and a 30% chance of failure (greater than 70).
Remember: On regular dice, a high roll means success. On percentile dice, a low roll means success. If you find this confusing, it's probably best to stick with a piecepack die or standard d6.