1. A method of obtaining enhanced answers to a plurality of questions comprising: accessing features comprising any one or more of: at least one feature for each of a plurality of judges, and at least one feature for each of the questions; accessing at least one answer for each question given by one of the judges and, for a plurality of the questions, more than one answer given by different ones of the judges; using a probabilistic learning system to learn an expertise of each judge using the features; and using the probabilistic learning system to determine enhanced answers to the questions by aggregating the answers in a manner which takes into account the identified expertise of the judges.