A cultural assimilator was developed to teach white junior officers about black culture in the army. Scenarios involving misunderstandings between blacks and whites in the army were presented, and respondents were asked to identify "correct" reasons for the misunderstandings. In the first of three field tests respondents showed evidence of learning from assimilator training, but cultural sensitivity to black culture on a related measure did not increase, and stereotyping was not reduced. In a second assimilator field test subordinates rated their company commanders as being more effective in race relations when commanders demonstrated greater knowledge of black culture. However, this was true only for white and Hispanic subordinates and not for black subordinates. A third assimilator evaluation and follow-up showed that neither self-reports nor supervisor nor subordinate reports provided evidence that trained personnel were seen as being more effective in race relations than those who received no training. It was concluded that assimilator scenarios may be useful training aids as part of race-relations discussions but are not likely to have a strong favorable impact by themselves. (Author/CSS)