MDEbug is a full-day workshop held as part of MODELS 2017. Since debugging in model-driven engineering is a relatively new research field with a growing community, this workshop’s main intention is to bring together interested researchers to focus the research effort. One objective will be to define the scope of debugging within modelling, and work out a (preliminary) roadmap for future research. The intent is to organize a highly interactive workshop, by stimulating discussion among researchers. We will have a keynote talk in the morning by Andrei Chiș, followed by paper presentations. Afterwards, a number of discussion points will be decided upon and discussed in small, focused groups. We encourage submission of position papers that can stimulate the discussions, as well as more mature work on debugging.