This dissertation aimed to advancing multi-modelling in MDE for integrated domain and business process modelling by proposing an integration of Merode, a domain modelling approach, and BPMN, a business process modelling language. More specifically, the three research objectives were formulated as formalizing the abstract syntax (RO1), the concrete syntax (RO2) and the semantics (RO3) of the integration between Merode and BPMN