Resumen: This paper has investigated the internal consistency and the factorial structure of a Spanish version of the Thought Disorder Scales using a sample of 102 individuals (50% men; Average age=40.84 years). The results support the internal consistency of the scales. During our research, it was found that the components of both scales saturate the same factor when they are compared with each other. Additionally, the research's data shows that the scales have good reliability. During our research, it was found that the components of both scales saturate the same factor when they are compared with each other. The totals of the factors from both scales have high values; more specifically, the FTD-Patient scale has a value of .937 and the FTD-Caregiver scale has .991. The exploratory factor analysis clearly demonstrated that the accumulated variance of the Thought Disorder Scales factors was 77.60%. Also, the invariance of this structure across gender was demonstrated. Overall our findings suggest that the REIS instrument is easy to understand and fast to complete, it is considered valid for the assessment EI in Spanish-speaking. Idioma: Inglés DOI: 10.15405/epsbs.2020.05.31 Año: 2020 Publicado en: The European Proceedings of Social & Behavioural Sciences 84 OPIICS 2019, 31 (2020), 289-294 ISSN: 2357-1330 Originalmente disponible en: Texto completo de la revista