INTRODUCTION: This article presents a cross-cultural adaptation of the Mental States Rating System, a content analysis scale applied to spoken, written or taped material, which covers a wide range of countertransference categories. METHOD: The following steps were performed: conceptual equivalence, item equivalence, semantic equivalence, operational equivalence, functional equivalence, and approval of the final version by the author of the original instrument. RESULTS: The study has reached the objectives of equivalence, and the final Brazilian Portuguese version has been approved by the original author. CONCLUSION: The study provides a Brazilian Portuguese version of an instrument that not only covers all the range of categories encompassed by countertransference described in the literature, but also expands it through the Mental States Theory. This represents a valuable tool for research on psychotherapy and psychoanalysis, where countertransference has proved to be an important resource, especially for the treatment of diseases based on early stages of development, for severe mental diseases and severe trauma.
Countertransference; Mental States Rating System; cross-cultural adaptation
