I've not read much about this definition, but it seems that a problem with focusing on the ability to predict is that to get useful work done, you have to reduc

I've not read much about this definition, but it seems that a problem with focusing on the ability to predict is that to get useful work done, you have to reduce everything to a decision problem. You have an ideal fitness function, but how are you generating ideas, plans or theories to evaluate? I personally prefer (although it's certainly less measurable) Ben Goertzel's definition - the ability to achieve complex goals in complex environments. It's still wishy-washy enough for people to write off any given achievement of AI though, I guess.