Executive SummaryThis article emphasizes that knowledge transfer across a firm's boundaries, in a transition context, implies a specific involvement of Western investors. They need to promote specific relationships within affiliates. This article emphasizes two points. First, partners have few common practices and do not share the same perception of the firm. This is the problem with building new capabilities. Second, Western firms have to mobilize organizational resources to build efficient affiliates (new human resources management, introduction of new functions, management by expatriates). Setting up new management rules to run an affiliate in transition countries is costly and often underestimated by foreign investors.