Certification (2) Violence (2) Traffic flow (2) Teachers (2) Students (2) Speeches, addresses, etc (2) Senses and sensation (2) School children (2) Mechanical movements (2) Interviews (2) Indexes (2) Id (Psychology) (2) Government publications (2) Education (2) Discrimination (2) Content analysis (Communication) (2) Communities (2) Children (2) Building (2) Adulthood (2) Activity programs in education (2) Enseñanza activa (2) Análisis de contenido (2) Espacio (2) Certificación (2) Mecanismos (2) Edad adulta (2) Estudio (2) Discursos (2) Índices (2)