Chili (2) Weights and measures (2) Schools (2) Quality of products (2) Population (2) Poor (2) Nursery schools (2) Measurement (2) Learning, Psychology of (2) Forecasting (2) Experience (2) Evaluation (2) Elementary schools (2) Education (2) Prospectiva (2) Evaluación (2) Escuelas primarias (2) Estudio (2) Calidad (2) Escuelas infantiles (2) Educación (2) Datos (2) Información (2) Experiencia (2) Pesos y medidas (2) Centros docentes (2) Población (2) Medición (2) Pobres (2) Aprendizaje (2)