In recent years there has been growing interest in the use of multi-level modelling approaches to better represent the multiple classification levels that are frequently found in the real world and are needed to effectively engineer languages. Multi-Level modelling approaches have not only been successfully used in numerous industrial projects and standards definition initiatives they are now supported by an array of dedicated tools. However there is still no clear consensus on what multi-level modelling actually is and what kinds of constructs and concepts provide the best support for it. For example, there are diverging views on whether it is sound to combine instance facets and type facets into so-called clabjects, whether strict metamodelling is too restrictive, and what principles should be used in establishing meta-level boundaries, etc. The goal of this workshop is to bring together researchers and practitioners interested in multi-level modelling to debate foundations, discuss challenges in applying multi-level modelling techniques and share experiences regarding multi-level modelling tools.