The variety of design artefacts (models) produced in a model-driven design process results in an intricate rela-tionship between requirements and the various models. This paper proposes a methodological framework that simplifies management of this relationship. This frame-work is a basis for tracing requirements, assessing the quality of model transformation specifications, metamod-els, models and realizations. We propose a notion of con-formance between application models which reduces the effort needed for assessment activities. We discuss how this notion of conformance can be integrated with model transformations.