Enterprise Modelling techniques and the associated visual languages become more important to support new approaches for business transformation and the development of ‘smart’ organisations. User-related holistic enterprise modelling requires capturing a multitude of enterprise aspects, business processes, inter- and intra-organisational integration as well as active knowledge management. These requirements are today mostly resolved with single non-interoperating modelling tools. The paper describes a generic extendible solution, the Unified Enterprise Modelling Language (UEML) for the interchange of enterprise models in a neutral format. The benefits of UEML have been demonstrated with three commercial modelling tools MO²GO, e-Magim and Metis.