Describe the features that tend to promote cooperation in a prisoner's dilemma game. What will ...

a) Strategy is one factor that has a large impact on cooperation rates in the prisoner's dilemma game. Research on strategy suggests that the tit-for-tat strategy (which is grounded in reciprocity) generates the greatest levels of cooperation (and thus points) in the prisoner's dilemma game.
b) Communication is also very important to promoting cooperation in prisoner's dilemma situations. If communication is not allowed or is difficult, cooperation rates tend to fall off quite a bit.
c) Individual differences also impact behavior in the prisoner's dilemma game. Some individuals are simply more cooperative than others. People who cooperate in the prisoner's dilemma tend to frame the game as a moral good/bad dichotomy, in which cooperation is the good or moral choice. People who defect in the prisoner's dilemma game tend to frame the game as a strong/weak dichotomy, in which cooperation is viewed as the weak response.