établissement scolaire (1) effet (1) Children (1) Individual differences (1) Twins (1) Resemblance (Philosophy) (1) Persons (1) Performance (1) Motivation in education (1) Manufacturers' agents (1) Human beings (1) Learning (1) Home (1) Diseases--Causes and theories of causation (1) Commission merchants (1) Children (1) Older people (1) Ability (1) Knowledge and learning (1) Etiology (1) croyance (1)