This chapter discusses competency aspects of participatory EnterpriseModelling. It presents the two main ways of working when it comes to involving stakeholders in the modelling process, the participatory and the non-participatory and then focuses on the participatory approach. The author describes the desired competencies of domain experts and method experts, two of the most crucial actors in the participatory modelling process. The author argues that in spite that competency is one of the most critical success factors in modelling it is an overlooked topic in modelling research. The chapter is illustrated with interview quotes from an interview study that the author has carried out.