Psychological research that involves cross-cultural comparisons has increased considerably during the last decade and is expected to escalate further. Given its growing popularity within mainstream psychology, cross-cultural research no longer can be considered the sole domain of experts trained in this specialization. Concomitant with this expansion, important methodological advances in quantitative psychology (e.g., measurement, statistical analysis, and research design) impact the study of cultural differences. The purpose of this article is to heighten awareness of important methodological advances among psychologists being prepared for or engaged in teaching, research, consultation, or other forms of practice that focus on diverse cultural groups. Credible and unbiased research findings coupled with psychometrically sound selection and use of assessment instruments contribute importantly to attaining the gold standard for all psychological research and testing practices. This article highlights methodological advancements and other issues that bear importantly on both the preparation and subsequent practices of psychologists in ways that promote credibility and lessen bias.