What was the outcome of the Robber's Cave experiment? Multiple choice question. Even though the boys were placed into two different groups, no in-group or out-group competition developed between the groups. When groups were required to work cooperatively to solve problems, positive relationships developed. 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