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<blockquote data-quote="AbdulAlhazred" data-source="post: 4987516" data-attributes="member: 82106">Well, you can do it for a given skill challenge fairly easily. Its just a simple sum of probabilities really. If everyone has to participate and discounting Aid Another its not hard at all. Aid Another is also not really ever mentioned as an option in SCs except for &quot;group checks&quot;. So personally I maintain AA doesn't apply to normal SC rolls and nothing WotC has ever published AFAIK is contrary to that. The very existence of secondary skills kind of indicates its not really supposed to be possible since AA would be equivalent to a DC10 secondary skill use and for most SCs that would be easier than any secondary (which often have difficult level DCs).As for the option to &quot;do nothing&quot;, its certainly not excluded by the core SC mechanics, but no DM should write an SC that allows that. Every character who is present and participating at all should have to make some kind of die roll. Otherwise you might as well just have the guy with the super high skill bonus in one primary skill sit there are roll a bunch of dice.The trick is to be able to calculate any kind of odds with various possible secondary skills, failure canceling rolls, one-time skill uses, etc. It can be done, but much like the issue with modeling combat you just never know what people will actually decide to do. Assuming they max their probability of success is logical but it would be nice to be able to compare options and see what happens when you change your SC design a bit.</blockquote>

[QUOTE="AbdulAlhazred, post: 4987516, member: 82106"] Well, you can do it for a given skill challenge fairly easily. Its just a simple sum of probabilities really. If everyone has to participate and discounting Aid Another its not hard at all. Aid Another is also not really ever mentioned as an option in SCs except for "group checks". So personally I maintain AA doesn't apply to normal SC rolls and nothing WotC has ever published AFAIK is contrary to that. The very existence of secondary skills kind of indicates its not really supposed to be possible since AA would be equivalent to a DC10 secondary skill use and for most SCs that would be easier than any secondary (which often have difficult level DCs). As for the option to "do nothing", its certainly not excluded by the core SC mechanics, but no DM should write an SC that allows that. Every character who is present and participating at all should have to make some kind of die roll. Otherwise you might as well just have the guy with the super high skill bonus in one primary skill sit there are roll a bunch of dice. The trick is to be able to calculate any kind of odds with various possible secondary skills, failure canceling rolls, one-time skill uses, etc. It can be done, but much like the issue with modeling combat you just never know what people will actually decide to do. Assuming they max their probability of success is logical but it would be nice to be able to compare options and see what happens when you change your SC design a bit. [/QUOTE]

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