In the Robbers Cave experiment, 22 white, fifth grade, 11 year old boys with similar average-to- good school performance and above average intelligence and a protestent, two parent background were sent to Robbers Cave State Park Summer Camp. None of the boys knew each other prior to the study. The researchers divided the boys into two different groups and assigned them cabins far apart from each other. Neither group was aware of the existence of the other group The boys developed an attachment to their groups throughout the first week of the camp by doing various activities together; hiking, swimming, etc. The boys were encouraged to choose names for their groups, e.g. The Eagles and The Rattlers, and added them onto shirts and flags.