There can be tokenism, alienation, lack of interaction. Perceptions can determine climate. Correcting misperceptions can be a fruitful approach. Discrimination at student and administrative levels affects psychological climate. Intergroup interaction is a factor.
Communication is most important - needs to happen throughout students and administration.
Lip service doesn't work. Prejudice is reduced when interracial contact is endorsed by authority. Grad students live solitary lives. Living arrangement is different from undergrads. There are no grad common areas.