This study reviews the current state of career maturity in secondary education--a period of education which is critical for development of this construct, when students are faced with ongoing academic and occupational decisions over the course of their studies. This paper is organized in three parts: first we focus on the concept, models, structure and development of career maturity; second, diagnosis and assessment are given shape through the "Cuestionario de desarrollo de la carrera" (CDC) and the "Cuestionario de madurez para la carrera" (CMC), adaptations of Super's CDI questionnaire and the CMI from Crites; and third, we discuss how to improve intervention. (Contains 4 tables.)