ABSTRACT
This chapter explores the three factors that promote cooperation among the members of groups and compare these to the factors identified as promoting helping and altruism. The first major question is how processes associated with helping translate into processes associated with cooperation. The second is whether there are different psychological processes that operate within the group setting to produce cooperation. Third, whether the processes that determine cooperation within groups are the same as those that determine cooperation between groups. The chapter examines the consequences of cooperation between groups. There is considerable research that shows the important role of trust in promoting cooperation in social dilemmas. P. Brann and M. Foddy defined trust as an expectation that a risky choice will be reciprocated and suggested that low trust induces defensive behavior. The arousal of an altruistic motivation directed toward one person thus increased the prosocial behavior at the individual level while undermining it at the group level.
