espanolEl cuestionario EFECO es un instrumento que permite valorar las funciones ejecutivas desde una perspectiva ecologica, ya que se basa en el reporte conductual de la vida diaria del sujeto. El objetivo de la investigacion fue validar el cuestionario EFECO en un formato de auto - repo rte. Participaron 250 adolescentes ecuatorianos entre 13 y 18 anos de edad ( M edad = 16.23, DE = 1.73). Se encontraron resultados significativos en consistencia interna ( α = .64 - .95), correlacion entre items ( r =.32 - .62), correlacion entre sub - escalas (r = .40 - .76), analisis factorial confirmatorio de dos factores ( x 2 = 38.87, CFI = .98, RMSEA =.06 [.035 - .094], SRMR = .027) y capacidad discriminante en monitorizacion, flexibilidad cognitiva, organizacion de materiales, iniciativa, memoria de trabajo y planificacion de adolescentes con diferente rendimiento academico. Se discuten los resultados en relacion a estudios pre vios y bajo la importancia de contar con un instrumento con validez ecologica para evaluar funciones ejecutivas. EnglishEFECO questionnaire is an instrument that allows assessing executive functions from an ecological perspective because it is based on a day - by - day behavioral report of an individual. The aim was to validate EFECO questionnaire in a self - report format. Parti cipants were 250 Ecuadorian adolescents aged between 13 and 18 years ( M age = 16.23, SD = 1.73). As results, there was found a significant internal consistency (α= .64 - .95), c orrelation among items (r=.32 - .62), correla tion among sub - scales (r=.40 - .76), confirmatory factor analysis of two factors (x 2 =38.87, CF I= .98, RMSEA=.065 [.035 - .094], SRMR=.027) and discriminant capacity in monitoring, cognitive flexibility, organization of material, initiative, working memory and planning of adolescents with differe nces on academic performance. In the discussion part, results are presented in relation to previous findings and taking on account the importance of having an instrument with an ecological validity to assess executive functions.