Another important aspect of some games is diplomacy, that is, players making deals with one another. Negotiation generally features only in games with three or more players, cooperative games being the exception. An important facet of "Catan", for example, is convincing players to trade with you rather than with opponents. In "Risk", two or more players may team up against others. "Easy" diplomacy involves convincing other players that someone else is winning and should therefore be teamed up against. "Advanced" diplomacy (e.g., in the aptly named game "Diplomacy") consists of making elaborate plans together, with the possibility of betrayal.