lotfi zadeh gzrdaeecsberkeleyedu dear rich interesting question stirred lively discussion question raised another question conceptual structure probability theory appropriate framework formulating definitive answer question view answer problem probability theory differentiate fuzziness randomness concomitantly possibility probability simple example meet valentina know old perception 40 instance valentinas age fuzzy variable 40 fuzzy value next suppose staying hotel ask doorman long take get airport taxi answer usually thirty minutes instance travel time random variable thirty minutes fuzzy event usually fuzzy probability event combinations fuzzy variables random variables governed different rules illustration suppose ask leave hotel 10 usually takes thirty minutes get airport time arrive try answer question using standard probability theory fuller discussion fuzziness randomness may found paper toward generalized theory uncertainty gtuan outline information sciences elsevier vol 172 140 2005 warm regards lotfi lotfi zadeh professor graduate school director berkeley initiative soft computing bisc thu 07 aug 2008 015333 0700 uai determinism versus choice