The following is an excerpt of the intervention methodology. For more information, please see the full text of the article on the publisher's website or through your institution's library.

In this research high school subjects responded before and after discussion to each of eight racial attitude items. Before discussion they were separated in to high-, medium-, and low-prejudice groups. [...] The subjects were seniors in psychology classes at three western Michigan high schools. About 2 weeks before the discussion experiment, 326 subjects were administered the [...] MRAI. The MRAI is a 100-item, ten-factor measure of attitudes toward blacks [...]. Of these 326 subjects, 256 participated in the subsequent discussion experiment. Materials for the discussions were eight racial attitude items [...]. [...] In the experimental condition, new questionnaires were distributed and the groups were asked to discuss each item for 2 minutes [...]. Control subjects discussed irrelevant materials [...]. [...] The basic dependent measure was the shift score for each group, defined as the mean of the group members' average final response per item minus their mean initial response. [...]