Open Workshop on “Enterprise Modelling and Ontology: Ingredients for Interoperability”. Enterprise models and ontology serve as valuable knowledge assets in the management of corporations. Due to the steadily growing need of integration of heterogeneous enterprise systems, interoperability gets a key issue in technical and semantic integration approaches. The workshop focuses on knowledge-oriented technologies, platforms and approaches to enable interoperability in the domains of enterprise management and enterprise systems. It solicits input from researchers, practitioners and technology providers with experiences related to technical and semantic interoperability. To participate in the workshop, acceptance of a submitted position statement is required. For further details please see the workshop section of the conference homepage.