Labor (6) Trabajo (6) Social sciences (5) Estudio (5) Ciencias sociales (5) Data envelopment analysis (4) Automated external defibrillation (4) Desfibrilación externa automática (4) Análisis envolvente de datos (4) Datos (4) Technology (3) Methodology (3) Measurement (3) Id (Psychology) (3) Tecnología (3) Metodología (3) Medición (3) Ello (3) Chili (2) Singapour (2) Evolution (Biology) (2) Time (2) Research (2) International relations (2) Industrial productivity (2) Good and evil (2) Finance (2) English language (2) Emigration and immigration (2) Education (2)