Final answer:
Creating an equal-status environment where groups work cooperatively towards common goals is the most effective way to reduce prejudice, backed by studies like the Robbers Cave experiment and the jigsaw classroom concept.
Step-by-step explanation:
The most effective way to decrease prejudice is to create an environment of equal status, where groups must rely upon each other to solve a common problem. Research, such as the Robbers Cave experiment by Sherif et al. (1961) and the jigsaw classroom designed by Aronson and Bridgeman, indicates that setting conditions for cooperative interaction with common goals can significantly reduce prejudices. Pettigrew and Tropp's (2006) meta-analysis reinforced this finding, showing that intergroup contact reduces prejudice, especially when the environment supports equality, shared objectives, and cooperation.
Diversity training in workplaces and imagining social interactions with different cultural groups have also been shown to positively impact attitudes and reduce prejudice, as suggested by research including Crisp & Turner (2009). Additionally, fostering professional, interpersonal, and collaborative relationships has been recognized as a means to reduce conflict and improve social harmony.