Decision table with large number of conditions and actions

If the number of conditions and actions is high (in my case, 12 conditions and 13 actions respectively!), making/maintaining a decision table with hand is proving to be really tough. The number of possible rules in the case at hand is huge (Y/N for 11 conditions and a 3-way choice for the 12th) and it's freaking me out. Also, these conditions and actions cannot be collapsed/coalesced; they 开发者_开发知识库are all needed very much.

What could be a better alternative to a decision table? What are some popular free tools to model the same?

Thanks so much.

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Have a look at ROBDDs.

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Statestep might be what you're looking for. Really powerful for dealing with large numbers of possibilities. Not normally free though, unless for education etc.