Enterprises increasingly execute complex transformations, such as mergers and splits, chain redesign, sharing and sourcing, and the rationalization of products, processes and applications. Its consequences are seldom sufficiently timely and completely discerned, while this is essential for governing such a transformation. Already in a small example we can see why Enterprise Ontology, as defined in DEMO (Design & Engineering Methodology for Organizations) delivers a clear and valuable instrument for transformation governance. Especially DEMO’s Construction Model, which is the most abstract ontological aspect model, combines high expressiveness with a high Return On Modeling Effort (ROME).