The purpose of this paper was to expand understanding on the possible influence that culture can have on outcome assessment, so that future researchers can fully address the effectiveness of psychotherapy across racial groups. However, outcome assessments are not often rigorously analyzed for test bias, which occurs when the outcome of a test is influenced by unplanned factors like race. Therefore, techniques common to cross-cultural psychology were applied on the popular outcome measure the OQ-45 to detect construct and method bias between an African-American and Caucasian group. The results of this study suggest that though OQ-45 does perform well overall across both ethnic groups, it is also the case that on some levels equivalence has not been reached. However, the impact of this lack of equivalence on African-American groups is not fully understood and more research should be conducted on the influence of culture on this assessment and the influence of culture on outcome overall.