The number of organisations involved in relief work in general and humanitarian logistics specifically is large and increasing, creating new complexity. In this paper we analyse different types of coordination and roles in two case studies of the humanitarian cluster system based on its initial development and the Kenyan Post-election crisis. The different and unclear roles of the organisations create significant problems before and after cluster activation and deactivation. Individual organisations take on many roles in the cluster system and beyond it in terms of coordination. The clarity of the roles affects the need for and ease of coordination. We suggest a simple basic categorisation of roles as a starting point for developing this concept in the field of humanitarian logistics and connect this to coordination.