According to your textbook, which of the following has not been found to be an effective way of improving intergroup attitudes?

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Increasing self-categorization refers to enhancing individuals' identification with their own group, which can actually exacerbate intergroup biases rather than improve intergroup attitudes. In contrast, increasing intergroup contact, changing social norms, and creating a common in-group identity are strategies that have been found to effectively improve attitudes between groups by reducing perceived differences and increasing empathy and understanding.

According to Your Textbook, Which of the Following Has Not