Abstract
The application of an ecological viewpoint for the description of language‐contact areas are analyzed here with the argument that they are of more importance for the study of unstable situations where one or more of the languages are in danger of dying out rather than those areas where multil‐ingualism has been stabilized by political or other means.
The findings and problems connected with censuses and questionnaires with respect to language‐contact areas in Belgium will then be examined. The different ways in which multilingual communities may develop according to language surveys and the effect of various socio‐psychological factors on their evolution are taken into account in the assessment of this ecological approach.