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The absence of a translated and validated instrument for measuring marital satisfaction in Brazil, the largest country in South America and fifth most populous country in the world, is a significant barrier for research and mental health service delivery. The purpose of this study was to translate and validate a marital satisfaction scale into Portuguese that would have both empirical credibility and cultural relevance in Brazil. A six-step serial approach was used to simultaneously translate and culturally validate the Revised Dyadic Adjustment Scale (RDAS). The translated instrument (RDAS-P) demonstrated good psychometric properties during field testing.