Distrito de Leiria (1) Teaching (1) Students (1) Stocks (1) Schools (1) Research (1) Quality of products (1) Nursery schools (1) Preschool teachers (1) Nature (1) Methodology (1) Experience (1) Elementary schools (1) Elementary school teachers (1) Education, Higher (1) Education (1) Academic achievement (1) Rendimiento académico (1) Profesores de enseñanza primaria (1) Profesores de enseñanza preescolar (1) Escuelas primarias (1) Calidad (1) Estudiantes (1) Escuelas infantiles (1) Educación (1) Experiencia (1) Enseñanza (1) Centros docentes (1) Naturaleza (1) Investigación (1)