After a fierce rivalry developed between the two groups of boys, psychologist Muzafer Sherif found that simply having the two groups of boys spend time together in peaceful situations, such as eating together in the dining hall, greatly reduced the intergroup tension.

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Sherif's Robbers Cave experiment showed that mere contact was not enough to reduce intergroup tension; cooperative activities with shared goals were necessary to reduce hostility.

After a Fierce Rivalry Developed Between the Two Groups of Boys