According to Sherif's Robbers Cave experiment,how can prejudice and intergroup hostility be reduced?

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Sherif's Robbers Cave experiment demonstrated that cooperative work on superordinate goals was the most effective way to reduce prejudice and intergroup hostility between two groups. This involved both groups working towards a common goal that was important to both of them, thus breaking down the barriers between them and increasing positive attitudes towards each other. This approach has been shown to be effective in other real-world scenarios as well.

According to Sherif's Robbers Cave Experiment,how Can Prejudice and Intergroup