sentences:  In the years prior to Allport’s framing of intergroup contact theory, social scientists had already begun discussing the conditions of intergroup contact that would produce intergroup anxiety, prejudice, or other “detrimental psychological effects”.Wilner, Walkley, & Cook, two years prior to "The Nature of Prejudice", studied segregation and integration in housing projects, and also suggested four conditions under which intergroup attitudes would change for the better.Under the assumption that prejudice arises from racial segregation, they suggested that it would diminish when members occupy “the same or equivalent roles in the situation,” share background characteristics like education, age, gender or socioeconomic status, perceive common interests or goals, and when the “social climate […] is not unfavorable to interracial association.”
  
  Concurrently, Carolyn Sherif and Muzafer Sherif developed their Robbers Cave experiment, an illustration of realistic conflict theory.