This article addresses the evaluation of organizational changes in the Dutch armed forces. Increasingly, megatrends in the risk society affect the organization of all armed forces. To cope with these trends, new strategic ideas are being developed that will change organizations fundamentally. The question, however, is the way these ideas are dealt with at the operational level. From this perspective, evaluation is needed. Evaluation of changes in large-scale, specific organizational settings is discussed here as an integrated approach using summative, formative, normative and constructivist elements. Pitfalls and challenges of this approach are discussed.