  We study the classical discursive dilemma from the point of view of finding
the best decision rule according to a quantitative criterion, under very mild
restrictions on the set of admissible rules. The members of the deciding
committee are assumed to have a certain probability to assess correctly the
truth or falsity of the premisses, and the best rule is the one that minimises
a combination of the probabilities of false positives and false negatives on
the conclusion.
