This thesis is a macro-sociolinguistic study and comparison of language status and use in Rwanda and Uganda. The data was collected in fieldwork. The study covers the main formal domains in society, both official and non-official. A model for analysis, inspired by Chaudenson, was created. Termed the Multilingual Management Model (MMM), it uses a quantitative method to investigate specific domains and units of analysis in the two African countries. The analysis provides a percentage measurement of the position of languages or language groups vis-à-vis other languages within the linguistic space of each domain, i.e. the analyses reveal how languages are stipulated to be used as well as the extent to which they actually are used within the specified domains of society. The MMM, which is also influenced by the work of Bourdieu, among others, is based on the assumption that languages compete on a linguistic market. The MMM can be used for similar work in other countries. The investigated domains are dichotomised into official multilingual management and non-official multilingual management. The MMM contrasts official language policy, institutionalised language use within official institutions, languages in education, and language use in state media, on the one hand, with language use in the domain of trade and commerce, language use on private shop signs and billboards, language use in the domain of religion, and language use in private media, on the other.