What was the outcome of the Robber's Cave experiment? Multiple choice question. When groups were entered into competitive task situations, a friendly camaraderie developed, and they got along better. Even though the researchers arranged for both competitive and cooperative activities, relationships among the boys did not improve. When groups were required to work cooperatively to solve problems, positive relationships developed. Even though the boys were placed into two different groups, no in-group or out-group competition developed between the groups