To model this aspect, it is necessary to specify and develop a more refined classification of reputation. A recommendation can be extremely precise; in the stock market, for example, an adviser, when discussing the reputation of a bond, can supplement his informed opinion with both historical series and current events. In informal settings, gossip, although vague, may contain precious hints both to facts ("I've been told this physician has shown questionable behavior") and to conflicts taking place at the information level (if a candidate for a role spreads defamatory information about another candidate, whom should you trust?).