Abstract
This paper examines single‐ and mixed‐sex elementary schooling in its effects upon the well‐being of girls and boys. Well‐being is defined in terms of adaptation to school life as reflected by affective characteristics such as self‐esteem, sense of mastery, stress, fear of failure, sense of belonging in school, study‐ and school commitment. Use was made of data concerning 2095 sixth‐grade pupils‐‐1130 boys and 965 girls‐‐in 60 private elementary schools. The results indicate that it is not the gender composition of the pupil population in se that exerts an influence but the gender composition of the teaching staff. Particularly, it is found that primary school boys are negatively affected by a school environment characterised by a preponderance of female teachers. Girls do not seem to be affected by the gender organisation of the school.