A prerequisite for learning is that instructions and other learning activities take place in a language that you understand. This may seem self-evident, but fact remains that most learners in Sub-Saharan Africa (SSA) are taught in a European second language (L2) that they are unfamiliar with. Frequently, the role of the home languages in the classrooms has been completely subtracted leading to very unfavourable learning situations for many pupils, something which in turn results in failures and early drop-out. The current paper takes up some of the challenges, dilemmas and consequences of current medium of instruction (MoI) policies as illustrated by theories and previous studies. Part 2 gives an outline of the analytical framework being developed under the "Understanding" project financed by the Swedish research Council. The purpose of the framework is to help reveal strengths, shortcomings and mismatches in current language-in-education policies. Focus lies on how different policy levels acknowledge the challenges involved in learning and teaching through a second language in SSA contexts. The model provides a systematic framework for explorations of how language-in-education policy outcomes (mis)match intentions. The framework, though adapted for SSA contexts, has direct relevance to the analysis of language-in-education polices in Western education systems.